1,Numeral and color LED display 2,CE,FCC,ROHS certifiate 3. Step-up buzzer alarm 4.2 years warranty LED car reverse parking sensor system 1,Numeral and color LED display2,Ultra slim dash mounted LED display3. Step-up buzzer alarm4.Left and right obstacle indication. 5,Numeral display from 1.8m to 0.3m6,Display unit with built-in buzzer7,2,3,4 sensors for option