... 4,6,8sensors for option 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 ... 2,3,4,6,8sensors for option7,Display size: 132*25*22mm 8,Wireless between display and control unit (HY5200L for option)package ... ctnG.W.: 12.4 kg /ctnMEAS:53*32.3*42cm display: