1.Parking Sensor System 2.Parking Sensor 3 color LED display&rear 4 sensors 3.BiBi-alarm sound or voice 4. ... color LED display 2, Step-up buzzer alarm 3,Left and right obstacle indication 4,Numeral display from 1.8m to 0.3m 5,Display ... unit with built-in buzzer 6,2,3,4 sensors for option 7,Display size: 132*25*22mm LED ...