The Smart Key broadcasts wireless data at 315 MHz, at the very low end of the UHF band. “What data does the Smart Key broadcast?” you may ask. Well, one of the things a Smart Key broadcasts its unique Key ID code, which is burned into its memory at the factory. The other is the Vehicle ID code, which is obtained from the car and burned to the Smart Key during the registration process. Just as a key blank is cut to work with a particular vehicle, the key registration process also alters the Smart Key to “fit” the “lock”.