Description:Digital colored LED display.Easy to install.Anti-freeze and rain proof.4 sensor system and advance chipset for enhanced coverage and detection.Help to prevent dangerous and costly collisions.Help to provide increased safety for passengers， pedestrians and family members who happen to be around the moving vehicle.Detect small children and low walls as well.Rate voltage:12V.Operating voltage:10.5V - 16V.Rated current:40mA - 300mA.Detecting distance:0.3m - 2.5m.Ultrasonic frequency:40KHZ.Operating temperature:-40¡ãC - 80¡ãC.Display working temperature:0 - 60¡ãC.Sensor color:black.System indicates obstacles by giving 5 different intervals of sound according to different distance:Distance Sound alarm Awareness.1.5m-2.5m Silence Safe distance.1.0m-1.5m Bip¡­Bip¡­Bip Pay attention.0.5m-1.0m Bibi¡­Bibi¡­ Be Alert.0.3m-0.5m BiBiBiBi¡­BiBiBi More Alert.0.0m-0.3m Continuous Dangerous distance.Package includes:1 x Main box.4 x Sensors.1 x LED display.1 x Power cable.1 x Hole saw.1 x Double side sticker.1 x User's manual