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What is a Smart Key Car Key? Variously known as keys for proximity Key fobs, proximity keys, or remote keys, smart keys work to unlock doors and start engines without needing to insert a physical key. They communicate by radiofrequency signals. Among other things, this helps to protect cars by blocking attempts at hotwiring. Smart keys transmit unique encrypted signals that keep access to other vehicles. Convenience Instead of inserting the key into an ignition slot to lock and unlock your vehicle simply by touching the door handle or trunk. Many modern vehicles also offer the option to remotely start your engine. This is particularly helpful if you are bringing groceries in or transporting passengers or equipment. This technology is designed to prevent vehicle theft. Smart keys transmit encrypted signals instead of a single frequency, similar to a traditional keyfob. What does this mean? Stuff Works Electronics explains that this stops other vehicles from receiving and responding to the same signal. Some manufacturers also use a computer-chip in the vehicle that recognizes the unique fingerprint of every key. This can help ensure that only authorized users are using it. This can be helpful in the event that you lend your car to family members and friends. Certain smart keys also save user settings so that mirrors, seat, and steering wheel adjustments, as well as stereo presets can be automatically set when the key is within range of the vehicle. Some smart keys can also be programmed to stop the vehicle from crossing a certain speed limit when started with that key. This can help keep novice drivers safe and is helpful if you have young children in the back. Security Traditionally, keys were cut from metal to open the ignition. Smart key technology eliminates this requirement. Smart keys are equipped with a special chip that sends a signal to your car's antenna. The signal is then received by the vehicle whenever the driver presses a button on the door handle or trunk release. This means that it's not possible to lock your keys inside your car any longer. The signal sent by the smart key to your vehicle is encrypted to ensure that only you have access to it. In addition, most models will shut off the engine if the car has not been started in the last few minutes. smart fortwo key replacement is especially useful when you're in a dangerous area or have to leave the vehicle for reasons of any kind, like at a gas pump. A number of systems also include the option of a backup system to open and re-starting the car if the battery of the smart key runs out while riding. The backup system typically involves placing the key in an opening or keeping it near a specific area of the cockpit to transfer energy to an electric motor. Certain manufacturers also include an emergency mechanical key blade hidden in the key that can be used to open the trunk and start the car should it be needed. Battery Life Many newer cars have keyless entry and push-button starting systems, controlled by a smart key fob that makes use of proximity technology to connect with the car. These systems are powered by a tiny transmitter that is powered by a lithium coin-sized battery. It will eventually require to be replaced like any other battery. The majority of smart batteries for key fobs last for several years however, this doesn't mean that they won't fail to power up and stop functioning abruptly. If the fob's battery is dead you won't be able to unlock or start your car even in the event that you put it close to the front door. It is not uncommon to see the transmitter of a smart key drain the battery. It sends a signal to the car each time you touch one button, however most of the time the smart key does nothing. The battery of the smart key is sufficient to last for several years of lock/unlock signals. The fob can also drain the battery if you keep it close to other devices emitting electromagnetic fields, for example phones and computers. These devices create their own magnetic fields, which could interfere with the fob's own transmitter, causing it to operate more slowly. RepairPal reports that the fob can cease to function if placed too close to the gadgets. Maintenance As opposed to the traditional car key, a smart one utilizes technology to control the locks on your vehicle, and also perform other functions. It functions by sending an electronic signal from the fob to antennas in and outside the vehicle. These antennas sense the signal and communicate with your car's computer. The car interprets the signal, permitting you to start or open the door without a physical key. New cars are loaded with the latest electronic technology, and the fob has become an interface for many of these functions. The most obvious ones are locking and unlocking, remote starter, and chirping to assist you in finding your car in a parking lot. Some fobs even let you store specific settings for various drivers and remotely open windows and sunroofs. The fob itself is a complex device that includes an integrated circuit board, and it can be damaged when exposed to cold or hot. The transmitter can be broken in the event of it being dropped or banged, and the battery contacts may also be bent. The issues are often difficult to determine and resolve. You can try using your phone to bypass the problem and see if this works however, it's always a good idea to keep a spare key in your pocket to use in case. You can purchase a generic replacement for the majority of OEM smart keys that cost up 70% less and is backed by a three-year better-than-OEM warranty.