Smart parking disc that automatically shows the time you parked. The parking disc has an accelerometer that senses the movements of the car. When the car is in motion, the display shows 0. After standing still for 20 seconds it shows the current time. After another 20 seconds it shows the next full or half-hour (according to current Swedish regulations).
No need to bother with a parking disc; unnecessary parking fines can be avoided.
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This tip is from 2016