A.buzz indication(lay buzzer in the display)
(2)0.8m0.4m: Bi,Bi,BiBi(the closer, the faster)
(3)0.4m0.0m: BiBi&(continuous beeping)
(1)2.5m0.3m: display the distance accurately
(2)0.3m0.0m: display 00 and you must to stop
(3)seven sects lights in three colors(green denotes safe, yellow denotes warning, red denotes stop), two sides lights indicate the orientation of obstacles, the number indicate the distance between obstacle and vehicle.
Detailed informatin on http://www.12vcity.com/car-rear-view-camera-rear-view-camera-system/car-dvd-ma-p004