I have just finished fitting my TTG 300 in my glovebox with the permanent docking kit so I thought I would share the pic. For those that don't know the car kit does the following: Direct power charging from your car battery (12V). TomTom GO switches on/off with your car ignition. Very clear voice instructions over your car stereo. The car stereo will mute for the TomTom GO voice instructions. Day/night view of your TomTom GO can be set to switch on and off automatically with the headlights.