... cable 2. No interference, no false alarm, digital sensor Digital sensor parking :Product Feature: - Three-color digital wireless LED display with buzzer built-in- Wireless ... transferred by car power cable, no false alarm, no interference- Digital signal sensors, very stable, best quality- Specially for truck, ... : -30ºC ~ +80ºC- Full-range technical support Wireless digital sensor parking (BW-680-4)