... 2.2,3,4,6,8sensors 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 ... control unit (HY5200L for option)package: Unit Weight: 0.58Kg 20 pcs/ctnN.W.: 11.6 kg /ctnG ...