When you insert the key in the ignition, Driver 1 or Driver 2 will be displayed on the screen. A message will not appear on the screen if the driver is unknown. The number on the back of the RKE transmitter corresponds to driver 1 or driver 2. The navigation system can store memory points for drivers 1 and 2 individually. See "Remote Keyless Entry Transmitter" in the index of your vehicle's owner manual for more information.