The system works automatically when reversing the backside Barriers real view, position detecting and distance can show on display directly Integration of the real view , digital display , speaking reminding able to working alone although the car audio stop working Four zone Division,security zone /Proper zone/ Prepare parking zone /parking zone ./as different different distance for different reminding .Bi..Bi..Whisper Product Technical Parameter : working voltage:12V Power : Pmax < 4W Sound volume : .90-105 dB Working temperture : -40 ～ +80 Best detect rang: 0.5-1.5M We can supply other type of goods you required,please contact us!