Video Recorder FunctionWhen the SD card (NOT included) is full, the monitor will delete the earlier manual/timing record file one by one and keep recording. Up to 32G memory card. This feature requires the REWRITE option to be turned on. Easy & Quick InstallationJust connect the 9-inch monitor with the camera cable and the power supply at the same time, and the video signal can be transmitted automatically. Voltage range from 12V-35V DC power to accomodate a wide variety of vehicle as Trailers, Trucks, Cars, Campers, Vans, Bus, Pickups, SUVs, Agriculture and heavy transport.