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What is a Smart Key Car Key? Variously known as keys that are in proximity, key fobs or remote keys, smart keys function to unlock doors and start engines without having to insert the key. They communicate via radiofrequency signals. This helps keep cars safe by not allowing hotwiring. Smart keys emit unique encrypted signals that prevent them from being used by other vehicles. Convenience Instead of inserting a key into an ignition slot instead, you can lock and unlock your car simply by touching the handle of the door or trunk. Modern cars often have a feature which allows you to start your car from a distance. This is especially useful when you're bringing groceries in or transporting passengers and equipment. This technology is designed to help prevent vehicle theft. Smart keys transmit encrypted signals instead of a single frequency, as a regular keyfob does. How Stuff Works Electronics explains that it is impossible for other cars to receive and responding to the same signal. Additionally, some manufacturers use a computer chip in the vehicle that can recognize the unique fingerprints of each key, which helps ensure that only authorized drivers use it. This is helpful in the event that you lend your car to family members and friends. Some smart keys can also store user preferences, so that seat, mirrors and steering wheel adjustments as along with stereo presets can be automatically set when the key is within reach of the vehicle. Some smart keys may also be programmed to stop the vehicle from exceeding the speed limit once the key is used to start it. This is a great way to keep new drivers safe and also beneficial to have children in the back of the vehicle. Security Traditionally keys for cars have been made of metal and used to unlock the ignition. Smart key technology eliminates this need. Smart keys are equipped with a special chip that sends the signal to your car's antenna. This signal is recognized by the vehicle when the driver presses a button on the handle on the door or trunk release. This means it's not possible to lock your keys inside your car. The signal sent by the smart key to your vehicle is encrypted to ensure that only you are able to use it. Most models also disable the engine if it hasn't been started in a few minutes. This feature is especially helpful when you're in a risky area or you have to leave the vehicle for any reason, for instance, at a gas station. Many systems also have a backup system for opening and starting the car in case the battery of the smart key goes out during a ride. The backup method typically involves placing the key in a slot or holding it near a specific part of the cockpit. This transfers energy to an electric motor. Certain manufacturers also include an key blade that is an emergency mechanical lock in the key which can be used to open the trunk and start the car in case of need. Battery Life Most newer cars have keyless entry and push-button start systems that are controlled by a smart key fob that uses proximity technology to connect with the car. These systems are powered by a tiny transmitter which is powered by a coin-sized lithium battery. It will eventually require to be replaced like any other battery. Most smart batteries for key fobs last for a while, but that doesn't mean they can't fail to power up and stop functioning suddenly. A dead fob means you won't be able to lock or start the car even if you place it close to the door to the front and the key fob light is flashing. It's not uncommon to find the transmitter in a smart key to drain the battery. smart car replacement key G28CarKeys sends a signal to your car each time you touch a button, but most of the time, the smart key isn't doing anything. The battery of the smart key is sufficient to provide several years of locking and unlocking signals. The fob can also drain the battery when it is placed in proximity to other devices that emit electromagnetic fields like computers and phones. These gadgets emit magnetic fields of their own which can cause interference and slow down the fob transmitter. In some instances the fob could be unable to function if the fob is left too close to these devices, as per RepairPal. Maintenance In contrast to the traditional car key, a smart one makes use of technology to control the locks on your vehicle and perform other functions. It operates by transmitting a signal to antennas situated inside and outside of your vehicle that detect the fob's signals and communicate with the car's computer. The car interprets the signal, and allows you to begin or open the door without a physical key. The fob is now a center of many electronic features that are now available in new vehicles. The most obvious features are locking and unlocking your car, remote start and chirping sounds to aid in locating your vehicle in a parking area. Certain fobs let you store different settings for various drivers, and remotely open windows as well as the sunroof. The transmitter itself is a complex device that includes an integrated circuit board and it is prone to being damaged by repeated use or exposure to cold or hot. The transmitter can be damaged if it is knocked or dropped. The battery's contacts can become bent. These problems can be difficult to pinpoint and resolve. Try using your phone to avoid the problem and see if this works however, it's a good idea to keep a backup key in your pocket just in case. You can buy a generic replacement for most OEM smart keys that cost up to 70% less and comes with a three-year, better-than-OEM warranty.