Notice: 1)We solely be sure that our rear view digicam can be one hundred pc paintings well with our dvr(Compatible Dvr Models: A20P, A37, A37P, A38, A45, A45P, A47, B04P, B11P, B36P,B44P); 2) We don't promise that your Dvr would be match with our rear view camera the rear picture sensor is varied Starlight Night Vision Fill in mild to allow you to make clear recordings in comparatively darkish environments Waterproof The use of sealed filling treatment, sealed water resistant effect, high concealmentto prevent dust, humidity, aggressive gas into Auto Reverse Parking When you get your vehicle in opposite gear, it's going to mechanically swith to therear digicam image with parking line and reveal it on dvr About Rear Camera Installation Please connect the rear camera&;s Red cable wire with your car opposite lamp power&;s Positive pole(+) after which plug the automobile charger into the cigar lighter to power delivery the automobile dvr When you get your car in Reverse Gear, the automobile dvr will automatically switch to the rear digital camera with parking line Then the car reversing operate will paintings