Alarm in three-stage sound: Bibibi Digital LED showing the distance LED display with three colors ( red, yellow, and green) Automatic detecting obstacles once reversing gear is activated Wireless module ( optional) Operating voltage: 10.8 to 15V Supply voltage: plus 12V more or less than 12V, 24V DC Power: 2W ( maximum) Ambient temperature: -30 to 70° C Storage temperature: -35 to 85° C Buzzer volume: -80dB