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What is a Smart Key Car Key? Smart keys are also known as proximity keys or key fobs. They are used to unlock doors and start engines without a driver having to insert physical keys. They communicate using radiofrequency signals. This helps to keep vehicles secure by stopping hotwiring. Smart keys transmit unique encrypted signals that stop them from being accessed by other vehicles. Convenience You can lock and unlock your vehicle without inserting the key into the ignition slot. Simply tap the door handle or trunk. A lot of modern cars include a feature that permits you to start your car via the internet. This is particularly useful when you're bringing groceries in or transporting equipment and passengers. This technology is designed to protect against theft of vehicles. Smart keys transmit encrypted signals instead of a single frequency similar to a traditional keyfob. This blocks other cars from being able to receive and respond to the same signal. This explains How Stuff Works Electronics. Additionally, some companies use a computer chip in the vehicle to identify the unique fingerprints of each key, which helps ensure that only authorized drivers use it. This is useful when you lend your car to family members and friends. Certain smart keys also store user preferences, so that mirrors, seats, and steering wheel adjustments, as and stereo presets can be automatically set when the key is within the range of the vehicle. For added convenience, some smart keys can be set to stop the vehicle from exceeding a particular speed limit when activated with a specific key. This can help keep novice drivers safe and is useful if you have young children in the back. Security Traditionally keys were cut from metal to open the ignition. Smart keys eliminate this requirement. Smart keys are equipped with a chip that sends an electromagnetic signal from the antenna to your car. The car can detect this signal when the driver presses the button on the trunk release or door handle. This means that it's impossible to lock your keys into your car anymore. The signal that the smart key sends to your car is encrypted, which means only the owner has the right to use it. The majority of models will also turn off the engine when the car hasn't been running for just a few minutes. This is especially helpful if you are in a dangerous area or you have to get out of your vehicle for any reason. Additionally, if the smart key battery runs out during a journey, many systems come with a backup plan of opening and starting the vehicle. The backup system involves placing the key into the slot, or putting it close to an space in the cockpit in which energy is transferred to an electric motor. Certain manufacturers have a mechanical key blade that can be used in an emergency situation to open the trunk or to start the vehicle. Battery Life Many newer cars have keyless entry and push-button start systems operated by a smart key fob that utilizes proximity technology to connect with the car. These systems rely on a small transmitter powered by a coin-sized lithium battery. It will eventually have to be replaced like any other battery. Although smart key fobs are made to last for a long time They can be suddenly lost power. A dead key fob means that it isn't able to unlock or start your car even if you keep it close to the front door. The key fob's light blinks. It is not unusual for the transmitter of a smart key to drain the battery. It sends a signal to the car each time you press one button, however most times, the smart key does nothing. A single signal to lock or unlock takes up a miniscule amount of the battery power of the fob, so there is easily several years ' worth of signals worth of battery life in the average smart key battery. The fob can also drain the battery when it is placed in proximity to other devices that emit electromagnetic field like phones and computers. These gadgets emit magnetic fields of their own that can interfere with and slow down the fob transmitter. In some cases the fob might stop working altogether when the fob is placed too close to these devices, according to RepairPal. Maintenance Smart keys differ from traditional keys made of metal because they use technology to control the security of your vehicle in addition to performing other functions. It functions by sending an electronic signal from the fob to antennas inside and outside the vehicle. The antennas pick up the signal and then communicate with the computer in your car. The car responds to the signal and allows you to open or begin it without using a physical key. The fob is now a center of numerous electronic features found in modern vehicles. The most obvious functions are locking and unlocking your vehicle, remote starting and chirping to aid in locating your vehicle in a parking lot. Certain fobs let you store different settings for different drivers, and can even remotely open windows as well as the sunroof. The fob is a complicated device that has an integrated circuit board, and it can be damaged when exposed to heat or cold. The transmitter could be damaged if it is dropped or banged or smashed. The battery contacts may also be bent. These problems can be hard to determine and fix. You can try using your phone to bypass the problem and see if that helps however it's best to keep a spare key inside your pocket in a case. You can buy an ordinary smart key replacement that's up to 70% less than OEM keys and comes with a 3-year warranty.