... obstacle indication. 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 ... built-in buzzer 7,2,3,4 sensors for option8,Display size: 130*16*14mm package: Unit Weight: 0.55Kg 20 ...