Parking disc The builtin clock on the back always shows the correct time. When parking, set the lever on the back to "Stop", the disc will show the arrival time and stop. The highquality running mechanism saves time and when you move the lever to "Run" the current time is displayed again. Power supply with an R6 battery (ordered separately).The function of the rotating parking disc does not correspond to the road traffic register regulation.The builtin clock on the back always shows the correct time. When you park, set the lever on the back to "Stop", the disc will show the arrival time and stop. The highquality running mechanism saves the time, and when you move the lever to "Run", the current time will be displayed again. Power supply with an R6 battery (ordered separately). The function of the rotating parking disc does not correspond to the road traffic register regulation.