Back‑up anti‑collision alert mounted sensor This device is an ultrasonic rear obstacle detection system and an invaluable aid to safety. With up to 4 sensors it is possible to detect any object within 3 metres. Features: • Ultrasonic and high‑tech sensor system • Detection range of 3 metres • Rapid response time • Waterproof and shockproof design • 12/24 V • Very easy installation • Performs very well in humid weather (even rain)