... (lay buzzer in the display)(1)1.5m—0.8m: Bi,Bi,Bi(2)0.8m—0.4m: Bi,Bi,BiBi(the closer, the faster ... )(3)0.4m—0.0m: BiBi…(continuous beeping)B.visual indication ... : 40KHzWorking temperature:Alarming volume: ≥63dBAlarming distance:1.5—0.1mDisplay distance: 2.5—0.3m auto parking sensor+parking radar+car reversing ...