How many cameras to monitor the bus? Can the mdvr recorder work after the engine is turned off?
It depends on customer requirements, generally there will be 4(or 8) cameras, these 4 cameras will be installed on different position inside the bus to capture the video of the passengers, door status etc. As long as the ACC key is ON, the mobile dvr will continue recording. ACC off, the device shut down. You can set delay-turnoff function, after the ACC is off, the device will work for 3min-240mins.