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What is a Smart Key Car Key? Smart keys are also referred to as proximity keys or key fobs. They are used to unlock doors and to start engines without a driver needing to insert physical key. They communicate via radiofrequency signals. This helps keep vehicles safe by preventing hotwiring. Smart keys broadcast unique encrypted signals that stop them from being used by other vehicles. Convenience You can lock and unlock your vehicle without needing to insert the key into the ignition slot. Simply press the handle on the door or trunk. Modern cars often include a feature that permits you to start your car remotely. This is particularly useful if you're bringing groceries into the vehicle or transporting passengers or equipment. This technology is designed to protect against theft of vehicles. Instead of sending one frequency signal as a standard key fob, a smart key sends out various encrypted signals to the car's embedded antennas when you approach it. This prevents other cars from being able to receive and respond to the same signal. This explaining how Stuff Works Electronics. In addition, some manufacturers use a computer chip in the vehicle to identify the unique fingerprint of each key, which makes sure that only authorized drivers are using it. This is helpful when you loan your car to family members and friends. Certain smart keys also save user preferences, so that mirrors, seat, and steering wheel adjustments as and stereo presets can be set automatically when the key is within reach of the vehicle. To make things easier, some smart keys can be configured to stop the car from exceeding a specific speed limit when started with that particular key. This can help keep inexperienced drivers safe and is helpful if you have young children in the back of the vehicle. Security Traditionally keys were made of metal to unlock the ignition. With the advent of smart keys however, this is no longer a requirement. Smart keys have a specific chip that transmits an antenna signal to your car. The signal is then recognized by the vehicle when the driver presses a button on the door handle or trunk release. This means it's impossible to lock your keys in your car any longer. The smart key's signal to your vehicle is secured so that only you have access to it. Additionally, the majority of models will stop the engine if the car has not been started in the last few minutes. This feature is particularly useful if you're in an unsafe zone or need to leave the vehicle for any reason, for instance, at a petrol station. A number of systems also include an alternative system for opening and starting the car in case the battery of the smart key goes out during a ride. The backup method involves putting the key into a slot or holding it near a particular area of the cockpit where the energy is transferred to an electric motor. Certain manufacturers also include an emergency mechanical key blade in the key that could be used to open the trunk and start the car if needed. Battery Life Most newer cars have keyless entry and push-button starting systems which are controlled by a key fob that uses proximity technology to connect with the car. These systems utilize a tiny transmitter that is powered by a coin-sized lithium battery. As with all batteries that will eventually require replacement. Most smart key fob batteries last several years however, that doesn't mean they'll never fail to power up and stop functioning at any time. If the fob's battery is dead you won't be able unlock or start your car even if you hold it up close to the front door. It's not unusual to find the transmitter in a smart key to drain the battery. It transmits a signal to the car each time you touch the button, but most times the smart key does nothing. The battery of a smart key is enough to last for a long time. lock/unlock signals. The fob may also drain the battery if it is located near other devices which emit electromagnetic fields, such as phones and computers. smart car key fob emit their own magnetic fields, which can interfere and slow down the fob's transmitter. RepairPal reports that the fob might cease to function if placed too close to the gadgets. Maintenance Smart keys differ from traditional keys in that they use technology to control the locks of your car, as well as perform other functions. It works by transmitting a signal through antennas situated inside and outside of your vehicle. They detect the fob's presence and communicate with the car's computer. The car is then able to interpret the signal and allows the user to open or start it without the physical key. New vehicles are loaded with modern electronic features and the fob has become an interface for many of these functions. The most obvious ones are locking and unlocking, remote start, and chirping sound to aid in finding your car in a parking lot. Some fobs allow you to store different settings for different drivers, as well as remote-operated windows and the sunroof. The transmitter itself is a specialized device with an integrated circuit board, and it is prone to being damaged through repeated use or exposure to cold or heat. The transmitter can be broken if it is hit or dropped, and the contacts on the battery can become bent. These issues can be challenging to determine and solve. You could try using your phone to solve the problem and see if that helps however, it's best to keep a backup 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 three-year warranty.