3.5 inches wireless rear view system 1.Frequency: 2.4GHz 2.display  picture behind vechile 3.automatic start when back up 4.Wide visiable area from camera 5.Good night vision 6.waterproof camera in 120 degree 7. Distance of wireless :20M with obstacle 8.with 3.5" LCD monitor and good cmos camera Specification : Monitor: panel: Au TFT LCD screen size:3.5inches display color:262K Pixel: 480X234 brightness: 250nit contrast: 150:1 Five languages OSD menu respond time:30ms The display with two video (AV1, AV2) Automatic/manual switcher Display format:4:3 system: PAL/NTSC input power:DC12V Front panel controls with on-screen menu Full function wireless remote control Shock resistant, designed specifically for mobile use camera: 1.high quality OV7950 sensor (1/4 cmos) 2.Good night vision, Minimum illumination:0.5 LUX 3. View of angle:120 4.perfect image and perfect color as CCD camera 5.waterproof ,IP67