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What is a Smart Key Car Key? Also known as smart car replacement key that are in proximity Key fobs, proximity keys, or remote keys, smart keys function to unlock doors and start engines without having to insert the key. They communicate with one another via radiofrequency signals. This helps keep cars safe by stopping hotwiring. Smart keys also transmit unique encrypted signals to stop them from being used by other drivers' vehicles. Convenience You can lock and unlock your vehicle without having to insert the key into the ignition slot. Simply tap the handle of the door or trunk. Many modern cars also have a feature which allows you to start your car from a distance. This is especially useful if you are bringing groceries in, or transporting passengers or equipment. This technology is designed to protect against theft of vehicles. Instead of transmitting a single frequency signal, as a standard key fob does, a smart key sends out several encrypted signals to a car's antennas that are embedded when you come close to it. How Stuff Works Electronics explains that this prevents other cars receiving and responding the same signal. Some manufacturers also include a computer chip inside the vehicle that detects the unique fingerprints of each key. This makes sure that only authorized users use it. This can be helpful if you lend your car to family members and friends. Certain smart keys can also save user settings, meaning that the seat, steering wheel, mirror and stereo presets can be automatically set when the key is in the range of the vehicle. To make life easier, certain smart keys can be programmed to stop the car from exceeding a specific speed limit when started using that specific key. This is a great method to protect new drivers, and it's also beneficial to have children in the back. Security Traditionally keys for cars have been made from metal and used to unlock the ignition. With the advent of smart key technology this is no longer necessary. Smart keys come with a chip that sends an antenna signal to your car. The vehicle recognizes this signal when the driver presses on the trunk release or door handle. It is now impossible to lock the keys in your vehicle. The smart key's signal to your vehicle is encrypted, ensuring that only you can use it. The majority of models also shut off the engine if it hasn't been running for several minutes. This feature is particularly helpful when you are in an unsafe location or need to leave your vehicle for any reason. A number of systems also include backup systems for opening and starting the car when the battery of the smart key is drained out during a ride. The backup system typically involves putting the key in the slot or placing it near a specific part of the cockpit, which transfers energy to an electric motor. Some manufacturers also have an emergency mechanical key blade inside the key that can be used to open the trunk and start the car if needed. Battery Life The majority of modern cars have keyless entry and push button starting systems that are controlled by a smart key fob, which uses proximity technology to connect with the car. These systems utilize a tiny transmitter, powered by a coin-sized lithium battery. Like any other battery it will eventually need replacement. The majority of smart batteries for key fobs last for a while, but that doesn't mean they can't go out of power and stop working suddenly. If the fob is dead, it won't be able unlock or start your car even if you hold it up close to the front door. It's not uncommon for the transmitter of a smart key to drain the battery. The smart key transmits the signal each time you press a button. However, most of the time, it does nothing. The battery of the smart key is sufficient to power several years of lock/unlock signals. The fob can also drain the battery If you keep it in close proximity to other devices that emit electromagnetic fields, like phones and computers. These devices emit their own magnetic fields, which can interfere and slow down the fob transmitter. In some instances the fob might stop working altogether if the fob is left too close to these devices, as per RepairPal. Maintenance Smart keys differ from traditional keys because they use technology to control the locks of your car as well as perform other functions. It operates by transmitting a signal to antennas placed inside and outside your vehicle. They detect the fob's signal and connect with the car's computer. The car is then able to interpret the signal and allows you to open or start it without the physical key. New cars are loaded with modern electronic features, and the fob has become an instrument for many of these functions. The most obvious ones are locking and unlocking, remote starting, and chirping sounds that assist you in finding your vehicle in a parking lot. Certain fobs let you store various settings for different drivers, and can even remotely open windows and even the sunroof. The fob is a complicated electronic device that includes an integrated board that can be damaged if placed in a position that is too harsh or exposed to extreme cold or heat. The transmitter may break when it's dropped or banged and the battery contacts may also be bent. These issues can be challenging to determine and repair. You can use your smartphone to bypass this problem to check if it is working. However it is recommended to keep an extra key in your pocket in a case. You can purchase a generic smart key replacement for up to 70% less than OEM keys and comes with a 3 year warranty.