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What is a Smart Key Car Key? Smart keys are also referred to as proximity keys or key fobs. They work to unlock doors and start engines without a driver having to insert physical keys. They communicate with each other via radiofrequency signals. In addition, it helps to protect cars by preventing hotwiring attempts. Smart keys broadcast unique encrypted signals that stop them from being accessed by other vehicles. smart fortwo key fob can lock and unlock your vehicle without the need to insert the key into the ignition slot. Simply press the handle on the door or trunk. Modern vehicles often have the option to start your engine from a distance. This is especially useful if you're bringing groceries into the vehicle, or transporting passengers or equipment. This technology is designed to help stop theft of vehicles. Instead of sending one frequency signal like a regular key fob smart keys send out an array of encrypted signals to a car's embedded antennas when you are near it. This blocks other cars from being able to receive and respond to the same signal. which explains how Stuff Works Electronics. Certain manufacturers also have a computer chip inside the vehicle which recognizes the unique fingerprint of every key. This makes sure that only authorized users are using it. This can be helpful should you lend your vehicle to friends and family members. Some smart keys can also store user settings, ensuring that the seat, steering wheel mirror, seat, and stereo presets are automatically set when the key is within the range of the vehicle. Certain smart keys can be set up to prevent the vehicle from going over a certain speed limit when you start the car with that key. This will help keep new drivers safe and is beneficial if you have young children in the back of the vehicle. Security Traditionally keys for cars were cut out of metal and used to unlock the ignition. Smart keys eliminate this need. Smart keys are equipped with an exclusive chip that sends the signal to your car's antenna. This signal is then recognized by the vehicle when the driver presses a button on the handle of the door or trunk release. It is now impossible to lock your keys into your vehicle. The smart key's signal to your vehicle is encrypted to ensure that only you can use it. In addition, many models will stop the engine if it was not started within the last few minutes. This is especially helpful if you are in a dangerous location or need to leave your vehicle for any reason. Many systems also have a backup system for opening and starting the car in case the battery of the smart key is drained out while riding. The backup system involves placing the key in an opening, or keeping it close to an area of the cockpit where energy is transferred to an electric motor. Certain manufacturers offer a mechanical key blade that can be used in an emergency to open the trunk or to start the car. Battery Life The majority of newer cars come with keyless entry and push-button start systems operated by a smart key fob that uses proximity technology to connect with the car. These systems are powered by a tiny transmitter that is powered by a coin-sized lithium battery. It will eventually have to be replaced like any other battery. 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 in the event that you put it close to the front door. It's not unusual for the transmitter of the smart key to drain the battery. The smart key emits an alert each time you press the button. However, the majority of the time, it does nothing. The battery of the smart key is sufficient to power several years of locking and unlocking signals. The fob can also drain the battery when it is placed near other devices that emit electromagnetic fields like computers and phones. These devices create their own magnetic fields, which can affect the fob's transmitter and cause it to run slower. RepairPal states that the fob may be inoperable if placed too close to the gadgets. Maintenance Contrary to the traditional metal car key, a smart one makes use of technology to control the locks on your vehicle as well as perform other functions. It works by sending a signal to antennas situated inside and outside of your vehicle. These antennas detect the fob's signal and communicate with the car's computer. The car interprets the signal allowing you to start or open it without the physical key. The fob is now a hub of many electronic features in new automobiles. The most obvious features are locking and unlocking your car, remote starting and chirping to help you locate your vehicle in a parking spot. Some fobs allow you to store various settings for different drivers, and even remote-operated windows and the sunroof. The fob itself is a specialized device that includes an integrated circuit board and it is prone to being damaged when exposed to heat or cold. The transmitter can be broken in the event of it being hit or dropped or smashed. The battery contacts may also be bent. These problems can be difficult to determine and repair. Try using your phone to bypass 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 purchase an alternative to the majority of OEM smart keys, which can cost up 70 percent less and comes with a 3-year, higher-quality guarantee than OEM.