Features: 1) No connecting wires between the mainframe and display unit in order to install easily and the distance can be 14m away and the best distance between them is 5-7m 2) On backing the car, the rear sensors detect obstacles automatically behind the car 3) LED display unit, indicating distance in number, as well as obstacles on the left or right side of the screen 4) 4 sensors for detecting 5) Detection range: digital distance display range: 1.5m - 0.30m Specifications: 1) Working voltage: DC12 2) Max. power: <5W 3) Working temperature: -20 ~ 60oC 4) Display distance: ≤1.8m 5) Alarm distance: ≤1.5m 6) Alarm loudness: ≥50dB Outer packing: 10pcs/ctn Carton dimensions: 34 x 21.5 x 39.5cm