Tempomat (CruiseControll) for smart for2 type 451 with the following functions: 1. Memory of the momentary speed and holds 2. Memory of the momentary speed as speed limits 3. And hold for risers of the momentary speed 4. Lower the momentary speed and hold 5. Return of the speed stored last. 6. Geschwindigkeitssignal z.B. for navigation equipment Simple installation through plug and play in max.30 minutes for each layman