... buzzer alarm 3.Numeral and color LED display description: 1,Numeral and 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 option7,Display size:90*23*23 mm package: Unit Weight: 0.56Kg ...