If you have parking problem, then this kit will bring the solution
This product is no longer in stock
Through the application of (ultra-sonic) sound waves whose frequency is beyond the threshold of audibility we can "measure" a distance. Consequently, a sensor mounted at the back of the car can give you an indication of the distance between your car and the car parked behind you or other obstacles (only at the same height as the sensor). When the preset minimum distance is crossed, an audible signal is generated.