Night-vision: This item gives a clear parking image, it performs well under the dark area with a little light.* G - sensor function: G-sensor automatically saves and locks videos in case of vehicles collisions to avoid video being overwritten.* 170° wide angle: helps reduce blind zone and captures virtually everything in front of your car, effectively providing your car with all round protection.* Rear Camera Lens: if you installed the back camera, When reversing, dvr automatically switches to display the rear lens image, and the full screen displays the rear environment assisted reversing.* 3 Camera lens: equipped with front view, car inside view and back view.  When reversing, dvr automatically switches to display the rear lens image, and the full screen displays the rear environment assisted reversing.*  2 camera lens(without rear camera lens): the front and inside lens is recorded at the same time, the front lens is wide-angle at 170°, the inside lens is wide-angle at 120°.* 3 camera lens(with rear camera lens): with front and rear view mold, inside the car mold. You can choose a different screen viewing mode, before and after the double record ,car inside and outside the same record, providing large wide-angle high-definition picture quality,wider vision, driving more secure.* 4.0in IPS HD screen: makes playback more clear and delicate.* F2.0 large aperture : high light transmittance, clearly restore the real image.* Loop-cycle recording: When the capacity of TF card is full, Dvr will delete previous video files automatically, and keep recording all the time.* Moving detection: When someone moving in the front of Dvr or car, it will record automatically.* Parking monitoring function: when DVR is shocked by any external forces, it will start turn on to record automatically.* Good quality material: ABS material, waterproof and durable, you do not need to worry about the fog or mist inside; the camera even works well at rainy day.* Rear camera installation:(1) Connect the rear camera's Red cable wire with car reverse lamp power 's Positive pole(+).(2) Then plug the car charger into the cigar lighter.(3) When you get your car in Reverse Gear, the car dvr will automatically switch to the rear camera with parking line