... high quality ,fast delivery, reliable warranty LED parking sensor,1. car rear 4 parking sensor system2. Self-test function activated when reversing3. ... CM level4.Sensor detection range:0.5cm~2.5m5.Display rang:28cm~2.0m6.Full-weather design,unaffected by wind, ice ... sensors optional10.Ultra-slim dispaly,buzzer built in&digital readout11. Power input 9.~16V DC parking sensor with beeper 4 sensors