... ,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: Unit Weight: 0.58Kg 20 pcs/ctnN.W.: 11 ...