main function: ◎Starting ACC/ON, if the brake signal is on and after 3-second, the front sensor works automatically until no brake signal after 5-second the display shut. ◎If the distance of barrier keeps steady, the display will shut automatically after 5-second ◎When the reversing return, the display will shut automatically after 20-second ◎When reversing, the rear sensors will works automatically and the front one will stop automatically. ◎The design with 6 sensors (2 front, 4rear) makes no blind spot ◎VFD display digital distance and right-and ?left obstacle ◎Sound alarming, mute alterative ◎Detecting distance: the front sensor detecting distance range is 0.3-2.0M, the same as the rear ones . ◎Sensor with a precision of 0.1M