In modern life, it is difficult to imagine the absence of special tools for convenience when preparing food. One of these is a can opener. This device comes in handy when you need a snack, but don’t have time to cook. Then you have to open canned food, but this cannot be done using improvised means.
A can opener is an important assistant in the kitchen.
Since the time when the first cans were invented, significant difficulties have arisen in extracting useful products from them. You can open the jar using a regular knife, but this procedure is not safe. You can damage not only the vessel, but also cut yourself.
Because of the difficulties described above, people came up with the idea of inventing a special device that would significantly simplify the process of opening sealed containers. Many tests were carried out before can openers were invented.
This revolutionary discovery made it possible to significantly simplify human life.
The invention first appeared at the beginning of the nineteenth century, when society was faced with the acute problem of opening tin cans. It was during this period that the technology of food canning actively developed.
Only after a significant increase in the number of canning manufacturers were knives for opening cans invented.
There are many different models from different developers on the market today, so you can choose any of them.
Features and purpose of can openers
In the twentieth century, can openers first received the look that many of us already know today. Since then, the design has remained virtually unchanged. It consists of a wooden or plastic holder, as well as a metal element that performs the cutting function.
Depending on the variety, there may be several cutting parts designed to open different containers.
There are designs with sharp teeth at the end. This makes them universal devices for opening cans for almost any purpose.
Modern devices are multifunctional devices that help out any housewife in the kitchen. A classic opener differs significantly from a similar device for cutting food. It has a different shape and size.
It will allow you to quickly and effortlessly open any jars for cooking or treats.
Some of the devices are equipped with additional design features that can significantly simplify the procedure for opening a can. Among them are magnets, wheels, and handles.
Modern products are distinguished by a special design that allows minimizing contact of the knife with the contents of the jar. This prevents metal particles from getting into the container.
Unlike old can openers, even children can use modern can openers.
Additional Information. You can find options that are designed for right-handers or left-handers. This approach allows people with special needs to simplify the process of opening a jar.
Precautionary measures
When opening canned food, several not very pleasant situations may arise. The most minor of them is damage to the can and the products inside it. Moreover, in addition to violating the presentation, microbes and even metal filings can get into the contents. In addition, a person can get injured, both during opening and after (the sharpness of the cuts must be taken into account). To prevent this from happening, you must adhere to a certain sequence of actions.
- Place the jar on a flat, non-slip surface (you can place a kitchen towel under it). This will help prevent slipping and tipping over. Under no circumstances should you open canned food on your weight or on your knees - the tool may slip and injure a person nearby.
- When opening a tin can, be sure to secure it with your free hand.
- All tools, even modern ones, must be used with extreme caution. Keep your fingers away from the sharp parts of the wedge, wheel or other cutting element. If you doubt your own abilities or have never had such experience, it is better to seek help.
- To avoid germs, all instruments must be washed or treated with a disinfectant. The jar also needs to be washed and dried.
- Beware of old rust on tools. Any can opener must be inspected for defects before use, otherwise it may break during the opening process.
- Beware of sharp cuts and jagged edges. As a rule, most manual openers give exactly these consequences. More modern models have fewer such errors, but not all of them do. For disposal, it is better to hold the jar and the cut off lid by the middle parts
If you do not have a specialized knife, it is better not to use other available means - this can be dangerous.
Types of can knives
On the modern market you can find different types of knives for opening cans, so each housewife will choose an option specifically for herself. There are several main types of devices, each of which differs in design and operating features. Depending on this, the most suitable option is selected.
You can use it to open a can of green peas or a bottle of beer in a matter of seconds.
Manual
These are the simplest types of devices that have been common for a long time. Characterized by durability and long service life. They are structures with wooden handles and a metal cutting part. It, in turn, consists of two elements - for opening cans, as well as prying off the lids on glass seals. This part is attached using plastic or wood. The strength and durability of the product depends on this.
Manual canning knives are durable.
The design with the wheel is just as simple. At the same time, it is safer compared to the previous option. By rotating the cutting teeth, the can is opened.
Mechanical
Such devices are more complex. At the same time, their functionality allows use in catering establishments. The operating principle is quite simple. The sharp end pierces the lid of the jar, after which it is secured. Rotation occurs using a special valve.
Such devices are used by the catering industry.
Additional Information. Typically made from durable steel. You can open up to thirty different cans per day. Fixes the structure tightly on the table, which allows you to quickly open the desired container. You can process up to five cans in a minute.
Among the special characteristics of such knives it should be noted:
- reliable fastening and a working surface that does not lend itself to rust formation processes;
- sharpened blade made of high-strength steel;
- a plastic bushing that can significantly reduce the force during rotational movement;
- high speed of assembly and disassembly, so there is no need to use additional equipment;
- Can be washed even in the dishwasher.
It is capable of uncorking any type of canning containers at a speed of 5 pieces per minute.
Note! This option is an excellent device for home use. Especially suitable for those who often open canned food.
Automatic
A simple and practical model that is very easy to use in practice. Batteries are used for operation. The device is installed directly next to the lid, after which it is started by a special switch.
This knife model is fast and easy to use.
It has the following advantages:
- ease of use at home - no need to make any effort, even a beginner can handle opening;
- safety - the opening points remain smooth, so it is impossible to cut yourself on them, which eliminates the possibility of domestic injuries;
- compactness – takes up a small amount of free space;
- there is a magnetic coating that allows you to easily attach the blade to the lid without damaging the contents of the jar;
- long service life - if used correctly, the device can last for many years.
Before using an automatic can opener, you should carefully study the operating instructions for the device. Care should be taken during operation. Keep the device out of the hands of children.
Before using an automatic can opener, you must read the instructions.
Do not use a bottle opener to open containers with flammable contents. To clean the product from contamination, it is necessary to completely remove the automation.
Electrical
The product looks like a manual analogue. Many models are made in the form of a cutting wheel with a wooden holder. Used to open a can at maximum speed. There is a motor inside that drives the impeller. Each model has different operating features.
The first device of this type was developed on the basis of a manual analogue with a cutting wheel.
It operates according to this principle:
- using the holder, the opener is fixed on the lid of the jar;
- the switch activates the motor, after which the automatic opening of the can begins;
- removing the retainer from the jar lid.
Modern manufacturers offer many different options. There are portable and desktop models. The first option takes energy from batteries, and the second - when connected to the network. You can also find multi-function devices that are designed to open different types of cans.
An electric can opener allows you to uncork containers as quickly as possible.
Important! Before you start opening the can, you need to carefully secure the opener with a lock.
What and how to open canned food?
If you apply force at the right angle and with the right pressure, a tin can can be opened with many available objects. Without a special opener, you can make a small hole in the lid. Next, you can use a spoon or its handle to widen the opening.
At the same time, it is important to be careful - often when opening canned food with objects not intended for this purpose, very sharp edges are formed, which are easy to injure.
A regular bottle opener
Using a can opener is the easiest way to open cans and is the recommended method. Common devices designed for this task are known as can openers.
The principle of their operation looks like this:
- It is necessary to place the opener perpendicular to the edge of the lid, hold it firmly in this position with your hands and apply force with pushing or striking movements until the tip of the blade makes a hole.
- Then you should push the blade into the pierced part of the lid and move the opener in a circle along the edge of the lid, holding it firmly by the handle with the blade facing forward.
- As a result, the lid will be separated from the container and can be lifted and removed.
Opener with wheel
Opening canned food with a modified opener is convenient when hiking and during outdoor activities. This device is equipped with a toothed wheel, is compact in size and light in weight.
It is very easy to open canned food:
- The wheel must be installed on the edge of the can lid and secured to the convex rim.
- Then you need to squeeze the handles of the device with your hands.
- As a result, the wheel breaks through the metal cover, which is accompanied by a loud hissing sound.
How to open canned food with a wheeled opener. - Next, you need to turn the container to cut off the top of the can in a circle, after which you can pick it up with a knife or your hands and remove it.
Knife and its handle
Regular kitchen, chef's, or camping knives are common for opening canned food, almost on par with bottle openers.
With their help, you can easily open any jars by following a few simple steps:
- You need to place the can on a stable surface (a table at hip height is ideal).
- Then you need to stand over the can to be able to hold it steadily.
- Next, place the tip of the knife against the inner edge of the lid, setting it vertically and not at an angle. It is necessary to grasp the handle so that your fingers are not in the path of the blade if it slips. The back of the hand should be facing up. This method is more effective than trying to saw off the lid with a knife blade (which risks damaging the lid and introducing metal shavings into the food).
- You need to make sure that the knife is completely locked in place so that it does not slip (you can do this by lightly tapping the handle with the back of your hand).
- The second hand should lightly push the first, squeezing the handle. This slight movement will cause the tip of the knife to pierce the lid of the jar. Do not push your hand too hard, otherwise the blade may slip.
- After this, you need to tilt the knife and make a new hole, placing its tip a few centimeters higher and repeating the previous steps. You must continue to follow these instructions until holes have been made around the entire circumference of the canning lid. Then you just need to connect them with sawing and cutting movements, as when using a special opener.
- Finally, you need to finally tear off the lid with a knife and remove it with your hand covered with a towel or sleeve (this is recommended to protect against cuts and scratches).
Canned food can also be opened with the handle of a knife under certain conditions. For this method, a tool with a significant mass and a voluminous handle (chef’s and similar types) is suitable.
The process of opening iron cans using this method looks like this:
- The jar must be placed on a stable surface. Do not place it on your knees or between your legs, otherwise the knife may slip and cause injury.
- Next, you need to grab the top of the knife with your palm just above the junction of the blade and handle. Your fingers should rest on the side of the handle, at a safe distance. It is important to ensure that the tool is held securely. This method can be dangerous if your hands or knife slip.
- Then you should place the “heel” of the knife against the inner edge of the lid. This is the area where the blade is widest, located at the opposite end from the tip. It should be centered directly under where your palm grips the knife.
- You need to make sure that this area of the tool fits snugly against the edge of the lid to eliminate the risk of slipping, and press it firmly so that it pierces the jar, leaving a small hole. If you don’t have enough strength for this, you can stand up and lean over the container, increasing the impact on it.
- Now you need to hold the knife with one hand and put the second on top, press firmly and continuously with both hands on the tool until the can lid is pierced. However, do not hit the can to pierce it, as the knife may come off and cause injury. Instead, apply slow, even pressure until the container is pierced.
- Don't be tempted to pierce the jar with the sharp end of a knife. The heel is more stable and slips less. In addition, the tip of the blade can be damaged by this use.
- Next, you should tilt the knife, move it a few centimeters along the edge of the lid and make a new hole next to the first one, using the same technique.
- After this, you need to continue making holes in a circle along the edge of the jar lid. Then you need to insert the tip of the knife into one of them, press and push the blade in a circular motion, using the same force as when using a standard bottle opener.
- Finally, you can pry the lid with a knife and lift it up. It is recommended to point the blade away from you to prevent injury in case of slipping.
Before removing the lid completely, it is advisable to wrap your hand in a towel or sleeve, as the edges may be very sharp.
Hands
Almost anyone can open canned food with a can opener or a knife, unlike a very risky method that requires considerable effort and good physical fitness. This method always turns out to be quite dirty and sloppy. It is best used for large jars that have grooves or "ridges" around their circumference. However, it is recommended to resort to this method only as a last resort.
This is done like this:
- You need to tear off all the labels on the can and find the grooves.
- Then you need to grab the container with both hands from different ends, and rest your fingers on the grooves near the middle of the top of the can. If your hands are not strong or large enough to do this, you should place the container on the ground and press the grooves with the strongest part of your palms.
- As soon as a dent forms on one side of the can, you need to rotate the container 180° and reinsert your fingers into the grooves, and make dents on both sides in the same place as deeply as possible. To do this, you need to hold the container horizontally, resting your palms on it so that they press on areas closer to the edges, and not to the center.
- It is necessary to squeeze the ends of the can very tightly, pressing on them with your hands, and then repeat this step on the other side.
- Continuing to squeeze the container on both sides, you need to apply an equal amount of compression to evenly deepen the dents around its circumference. This should be continued until the jar takes on an hourglass shape.
- When the body is completely deformed, you need to firmly grasp the ends of the container and slowly move them apart. It is necessary to carefully spoon its contents into a separate container and remove any metal fragments that accidentally got into the food.
Spoon
Another well-known way to open canned food is using a metal spoon.
It is carried out as follows:
- Place the jar on a stable surface and place the tip of a spoon on the inside edge of the lid. It always has a small convex circular edge.
- You need to place the spoon at any point and hold it strictly vertically, and then start moving it back and forth in a small area, creating friction.
- This will thin the lid of the jar, so you need to continue until a hole is formed.
- Then you need to move the spoon to the side and continue rubbing next to the damaged area. As a result, the hole made in the lid in the previous step will become slightly larger.
- Next, you need to continue moving the spoon and wiping the lid until it is damaged all around. In this case, you must not turn the container over, otherwise its contents will begin to flow out.
- After this, you should hook the spoon under the edge of the lid and lift it up until it is almost completely separated. If you can't pick it up with a spoon, you can use a knife to saw through any small parts of the lid that remain attached to the jar.
- The wiped edges of the container will be sharp, so care must be taken not to cut your fingers when opening. It is advisable to protect your hands with a towel or other cloth.
Using sandpaper
If you don’t have a can opener, you can open canned food with other sharp tools that can cut through a metal surface.
This can also be done using sandpaper:
- You just need to grind the top convex edge of the can with it until it wears through. When moisture appears on a sheet of sandpaper, this indicates the formation of a hole.
- It is necessary to periodically rotate the container so that the edge wears evenly, and from time to time squeeze it to enlarge the hole.
- Then you should wipe off the metal shavings and open the lid.
This method takes some time, but it almost always works. Therefore, it is considered useful in cases where there is no knife or spoon at hand.
Mechanical key
Mechanical devices are rarely used at home. These are large openers that are fixed to the surface of the table, and then the container to be opened is placed in them. The mechanism includes a sharp knife and handles for its rotation, as a result of which the lids are easily and quickly separated from the cans.
Automatic opener
Opening cans with a battery-powered opener is very convenient. This device is installed on the surface of the lid and a mechanism is activated that quickly moves the knife along the edge of the lid and cuts it off.
Electric machine
Electric machines for opening cans work very quickly and require virtually no participation in the process (only sometimes you may need to hold the container so that it does not tip over during opening):
- Place the device on the surface of the cover and press the power button.
- After this, a mechanism is launched that cuts off the lid by passing along its edge with a sharp knife in a circle.
Rolling
Rolling on a hard surface can open most metal cans:
- It is necessary to place the container with the lid down on a hard, rough surface (asphalt, large stone, concrete, etc.).
- Holding the jar with your hands, you need to rub it with the edge located along the edge of the lid along the selected uneven structure.
- As soon as liquid begins to appear on the edge, you should squeeze the container with great force. As a result, the lid, which has begun to separate as a result of friction, will bounce upward.
With a belt
Opening a can with a belt seems unlikely, but it is actually a good method.
It is as follows:
- The belt must be folded into a loop and secured with a buckle.
- Then you need to throw it over the top of the tin can and tighten it as tightly as possible, moving it counterclockwise.
- At the same time, the container must be rotated clockwise.
- After a while, the lid will separate from the container with a loud bang.
Hairdryer
In addition to mechanical methods, canned food can also be opened by heating. The best and most controlled way to do this for rolled glass jars is to use a hair dryer.
They do it like this:
- It is necessary to evenly heat the entire upper part of the tin can with a hairdryer, directing the hot air clockwise.
- To keep warm, it is recommended to wrap the jar with a towel or thick cloth.
- After this, you need to start unscrewing the hot cap counterclockwise until it begins to give way.
Using rubber gloves
Rubber gloves help in opening glass jars with rolled lids. They are recommended to be used when using any methods - both standard and unusual.
In addition, they provide additional safety by protecting your hands from damage.
How to choose the best can opener?
When purchasing, you must follow some rules. Please consider the following product parameters:
- the material from which the cutting part is made;
- features of use - how easy it is to open the can using this design;
- principle of operation and functionality of the product;
- dimensions of the device and its weight.
Handles made of plastic are more practical as they do not slip in the hand.
The impeller is usually made of stainless steel - this is the most durable material.
The manual type of construction must be securely fastened, and there should be no nicks or roughness on the surface. When purchasing an electrical product, you should pay attention to the material used and the type of power supply. Desktop models must be protected from slipping, since the safety of operation of the product directly depends on this.
There is no need to make any effort to open the jar.
Best lists
After the rich variety of models described above, we decided to organize a list of the best in the following categories:
- Best price.
- Electric.
- Mechanical.
Let us focus on each item indicated and its main technical parameters.
Best price
Webber (0R-00003152) Delta is used primarily for opening screw caps. The knife will be an excellent assistant in the kitchen, because it not only opens pickles, but also knows how to close them tightly. Thanks to its special type of design, the model is able to work with lids of various diameters.
Color | green, gray |
Material | plastic |
Country of Origin | China |
Material | plastic |
Weight | 250 g |
Cost: from 50 to 90 rubles.
can opener Webber (0R-00003152) Delta
Electric
Endever Smart-25 is made in an unusual black design. Near the lever there is a special magnet that prevents the cover from falling and does not allow it to move during operation. The manufacturer equipped his creation with two unique, in his opinion, functions - sharpening knives and quickly opening bottles.
Guarantee period | 1 year |
A country | China |
Power consumption | 70 W |
Material | steel |
Length of cable | 0.7 m |
Frame | plastic |
Cost: from 800 to 1000 rubles.
can opener Endever Smart-25 and
Mechanical
Regent inox Linea CUCINA 93-CN-04-02 is made of high quality stainless steel. Able to open any canned food, thanks to which it will take pride of place in your home. The wear-resistant material promotes long-term service as it almost never oxidizes.
Material | zinc alloy |
Weight | 0.29 kg |
Dimensions | 0.2x0.6x16 cm |
Country of Origin | China |
Color | black |
Cost: from 400 to 750 rubles.
can opener Regent inox Linea CUCINA 93-CN-04-02
How to use a can opener?
Depending on the type of product, the rules for its operation differ. Using it will require some skill, otherwise problems may arise. Below we will discuss the rules for using the main types of products.
The manufacturing material must be chosen to be reliable and of high quality.
How to open a can with a can opener?
If you have an older can opener design, then follow this procedure to open the can.
- Direct the cutting end perpendicular to the working surface. Press down on the handle to drive the cutting part deeper. Over time you will learn to do it correctly. Such openers are the most common option, despite the existence of advanced designs.
- Please note that you must firmly support the jar you are opening while opening. During the learning process, it is recommended to use the help of another person.
- Place the knife into the hole and begin to widen it. At the same time, move forward.
- Cut the tin can using forward movements. Carefully walk around the already cut part, as there are very sharp teeth there. Otherwise you may get hurt.
When opening a can using a manual model, try to hold the container firmly on a hard surface.
Be careful not to touch sharp edges to avoid damaging your skin.
How to use a can opener with a wheel?
Before you begin the opening process, carefully study the design of the can opener and follow the algorithm.
- Place the sharp wheel on the lid of the tin can. Level it if necessary. Secure the device using a wedge. To learn how to do this quickly, you need to practice.
- Secure the wedge firmly and then begin to move along the working line. During rotation, the lid will begin to yield and open.
- Rotate the handle and move along the edge until you open the lid.
Opening jars should be convenient.
How to use an electric can opener?
To properly open a jar using an electric knife, follow the instructions.
- Place the can under the cutting wheel. Secure it firmly so that the container does not slip off during opening.
- Start your device. Support the jar so it doesn't tip over.
- The electric opener has a magnet on the end that holds and lifts the lid as it opens. Go to the end of the lid. The process can be considered completed. It won't take much time.
You can choose multifunctional appliances.
Features of a can opener
Each type of structure requires compliance with certain care rules:
- Do not use hot water for washing;
- some models are not dishwasher safe;
- The product can be stored with other kitchen appliances;
- You can use any detergent for cleaning.
How to use a can opener directly depends on the type of design.
Safety precautions when opening a can without an opener
All actions associated with opening a tin container without a special device carry the risk of getting a cut or abrasion. Therefore, when using available means, you should follow safety precautions so as not to cause harm to health.
Do not open a tin can with a knife while placing it on your knees or holding it between them.
To protect your hands from cuts, you can protect them by wearing thick gloves or wrapping them with cloth.
If you still cannot avoid a cut, you need to wash the wound with running water, treat it with an antiseptic, apply a gauze bandage or stick on a bactericidal patch.
Thus, using some techniques and devices, you can open cans even if a special knife is not available. However, when going on a hike or picnic, you should take a can key with you. This device will not take up much space and will help avoid injuries and waste of extra time.
Popular models of can openers
Can opener MVQ 75020PCO
The model is attached to the table. Ensures that the can is securely fastened during opening. Characterized by safety and durability.
Used in industry and everyday life.
Can opener Tescoma President
Universal device made of high quality stainless steel. Characterized by convenience, stylish design and ease of use.
Tupperware can opener
Allows you to open the jar safely without sharp ends. Allows you to open a jar of any diameter with minimal effort.
The opening mechanism does not come into contact with food.
Can opener IKEA STEM
A revolutionary device at an affordable price. Allows you to open jars of different sizes and diameters. Even a child can handle opening the can, thanks to the security system.
IKEA KONSIS can opener
The device is made of high quality stainless steel. An indispensable device in the kitchen of any housewife.
Can only be washed by hand.
Can opener Joseph Joseph Can-Do
A bright and stylish device of a new generation. It is characterized by high functionality and ease of use.
Allows you to carry out many operations.
A bottle opener is a must-have device in the kitchen. Be careful when choosing a product. Try to buy products only from trusted manufacturers.
Comparison table of characteristics
The table below presents the main characteristics of the products in question. By comparing them with each other, it will be much easier for you to choose a knife that suits your wishes and needs.
Model name | A country | Weight, in g | Color |
Regent Inox | China | 240 | silver, black |
6 in 1 Kitchen CanDo | China | 200 | orange, green, gray |
JOSEPH JOSEPH CAN-DO | China | 100 | grey |
NADOBA SIRENA | Czech | 198 | gray-black |
Fackelmann Lichfield | Germany | 230 | black |
TEFAL INGENIO | France | 240 | red, black, silver |
Tescoma Presto | Czech | 100 | steel |
Efficient models with non-slip handles
USLANBFAY RYP138-08
A multifunctional product that is sold at an affordable price. It is made of stainless steel, which guarantees trouble-free operation over a long period. The cutting head is made of hardened steel, which increases the reliability of the tool. There is a handle with an anti-slip coating, which increases safe use.
Sold at a price of 350 rubles.
USLANBFAY RYP138-08
Advantages:
- High service life;
- Reliability;
- Easy to use;
- Sharpness.
Flaws:
- Not found.
SENTORE CO3032
One of the best can openers that can handle a variety of cans and uncork the container in a matter of seconds. This product is manufactured using high quality steel, which guarantees easy and efficient opening. Maintenance takes a minimum of time, since the mechanism is understandable even to an inexperienced user.
The average cost is 300 rubles.
SENTORE CO3032
Advantages:
- Low cost;
- Convenient rotating element;
- Good anti-slip coating;
- Reliability.
Flaws:
- Not detected.
ATMOSPHERE Fun Kitchen
A good budget option that comes in 4 vibrant colors. The product is durable and will not let the owner down in a difficult situation, which is an advantage. Opening takes a minimum of time, while rotation is carried out without much effort.
The average cost is 310 rubles.
ATMOSPHERE Fun Kitchen can opener
Advantages:
- Durable design;
- Sold in 4 colors;
- Service life several years;
- Designed for long-term use;
- Price and quality.
Flaws:
- Not found.
Rules of use and care
How to use a can opener directly depends on the type of design:
- The hand knife must be positioned with the tip down, hit the handle until a hole is formed in the metal. Hold the jar with one hand and open it with the other in a circle, moving evenly up and down. You should not make a full circle; when 2-3 cm remains, you need to lift the lid up.
- Before starting to work with a mechanical knife, you need to open the handles all the way, then attach the product to the surface so that the wheel is located above the lid. Next, squeeze the handles until they click - this requires some effort. Having fixed the holder with one hand, begin to rotate the lever located on the right with the other. Now no more effort is required: the lid opens easily.
- The cutting head of the electric knife should be placed on top of the can. The position should be such that the wheel remains on one side and the cutting part on the other. After lowering the cutting element, the device will begin to rotate the can, so it is recommended to hold it. When the circle is completed and the lid comes off, you need to lift the knife. Typically, a small magnet is provided to hold the lid, which is removed along with the cut off part.
A can opener is an easy-to-use product. However, it must be remembered that the device cannot be washed with hot water, and some models cannot be washed in the dishwasher. A modern can opener is compact and does not take up much space, so you can store it anywhere convenient: in a drawer with cutlery, on the outside of the refrigerator door, and so on. Caring for a model with an opener also does not require significant effort; it can be cleaned with ordinary dishwashing detergent.
Manual
Mechanical
Electronic