The Valeo parking sensor kits are a handy tool if you definitely want to know that you are parking good and safe.
Specifications:
Number of sensors: 4
Power supply: 12V
Installation location: front and back
Category: cable-bound parking sensors
Mounting method: built-in sensors
Max. range: 170cm
Sensor range (max.): 170cm
Sensor range (min.): 10cm
Signaling: acoustic