Automatical round view when starting: When car engine starts, the system will activate the car monitor and the all the camera around one by one to check the view around for 10 seconds, then turn off. Automatically rear view:When you pull the reverse gear (Left/Right turning no triggered), the system will activate the monitor and rear view camera till the reverse gear back, then switches to front view camera for 10 seconds then shut off. Front view mode:The system start with front view mode as default.Front view controlled by switch(included) .Press the control switch for 2 seconds, car monitor and car front view camera will be working all the time, if no other trigger working. And then you could shut off the front view video by re-press the control switch for 2 seconds. Side view mode:Press the control switch less than 1 second to enter Side View Mode.When you turn on the turning switch, this system will activate Monitor and Side view camera (Left/Right side view camera is controlled by Left/Right steering lamp). The monitor and camera will turn off after 1.5 seconds when steer turning is finished.Press the control switch less than 1 second again to enter Front View Mode. 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 Colour:Black Material:ABS Package Contents: 1 x Host 4 x Camera Extension Cord Only the above package content, other products are not included. Note: Light 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.