System will be activated when the vechicle is reversing, and indicates the rear object distance. System will diagnose the four sensors, and indicate the fault one in the display; Full angle LCD, warning sound can be turn on/off; Long detecting range up to 2.5m; Wireless transmit saves 70%installing time; Meter and inch unit are alternative; Particular outline design, integrated with car panel perfectly; All sensors pass aging testing, anti-jamming of electromagnetic wave.