Video output: Two videos output, one for car monitor, the other for car DVR. Front view camera power: supplied by control box system. Rear view camera power: supplied by control box system, or could be supplied by reverse lamp power. Left/Right side view camera power: supplied by control box system Trigger priority: Right View--Left View--Back View--Front View Switch function: Press for less than 1 second: Side View mode / Front View mode Press for 2seconds (in Front mode): Front View always working / Front View turn off Parameters: The system working current: Max: 50MA. (Excludes working current of cameras) The system working power: 9-30V. (Power supply to cameras is the same as the system input voltage, in 24V vehicle, please use 24V cameras) System signal: PAL/NTSC/SECAM Video output: 1.0VPP/75 Camera: Image Sensor: PC1099 Optical Size: 1/3 inch Pixel pitch: 5.0 x 7.4um Effective Pixel: 720*480 Horizontal Resolution: 580 TV Lines Dynamic Range: Greater than 72dB S/N Ratio: Greater than 48dB Min. Illumination: 0.1 luxView Angle: 170 Degree color:Black Material:ABS Package Contents: 1 x Host 4 x HD Camera(Front, Rear, Left, Right) 4 x Camera Extension Cord 1set x accessories Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.