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This is particularly useful if you are bringing in groceries or transporting passengers or equipment.<br><br>This technology is designed to deter theft of vehicles. Instead of sending a single frequency signal, like a traditional key fob does it sends out several encrypted signals to the car's antennas that are embedded when you walk towards it. How Stuff Works Electronics explains that this prevents other cars receiving and responding to the same signal.<br><br>Certain manufacturers also have a computer chip inside the vehicle that recognizes the unique fingerprints of each key. This can help ensure that only authorized users use it. This is useful for when you loan your car to family and friends.<br><br>Some smart keys also store user preferences, so that seat, mirrors, and steering wheel adjustments, as well as stereo presets can be automatically set when the key is within range of the vehicle. 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The car responds to the signal and allows you to open and start it without having to use the physical key.<br><br>The fob is now a center of numerous electronic features on new vehicles. The most obvious are locking and unlocking, remote starting and chirping sounds to assist you in finding your car in a parking lot. Certain fobs let you save different settings for different drivers, and can even remotely open windows and the sunroof.<br><br>The fob itself is a complex device with an integrated circuit board and it is prone to being damaged by hard use or exposure to cold or heat. The transmitter can be damaged if it is damaged by being dropped or smashed. The battery contacts may become bent.<br><br>These problems can be difficult to identify and fix. You can use your smartphone to get around this issue to determine if it's working. However you should always keep a spare key in your pocket or case. 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