... *27*20mm 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 ... 6,Buzzer alarm switch:on/off 7,2,3,4 sensors for option8,Display size: 96*27*20mm package: Unit Weight: 0 ...