... .2,3,4 sensors for option 3.Display size: 130*16*14mm description: 1,Numeral and color ... LED display2,Ultra slim dash mounted LED display 3, Step-up buzzer alarm 4,Left and right ... obstacle indication. 5,Numeral display from 1.8m to 0.3m 6,Display unit with built-in buzzer 7, ... 2,3,4 sensors for option8,Display size: 130*16*14mm package:Unit Weight: 0.55Kg ...