I assume you mean the car with the hinged flap in the top of the dash?
This being so then the answer is that it just mounts and powers the TomTom; there are no other functions.
Mine is a TomTom One V5 IQ routes and it has been long obsolete. Despite this I find it excellent and it's easy to remove so that it can be used in the house for route planning - it lifts out with bracket attached. All TomToms use the same maps and the same routing algorithm so I feel the cheaper ones are better value. All mine really lacks are spoken street names and I don't miss that.
Remember you need the mounting bracket too and I don't know if you can still get them. There were brackets made for other models and I believe for Garmin too.