Auto Rover Mobile DVR, 4 Channels Car Vehicle AHD Car DVR, Surveillance System for Trucks, Trailers, Vans, Buses 4-CAMERA CHANNEL SYSTEM: This car DVR comes with 4 available video camera inputs for a 4-channel surveillance system. The channels can be viewed by using split screens or full screens of each camera. VIDEO AUDIO RECORDING: A mobile DVR surveillance system that can record video and audio for users safety. VIDEO SYSTEM: PAL/NTSC - Remote Control. With these, it is very easy to navigate the rear view camera footage, set recording settings. SUPPORT SD CARD: 4CH Car Vehicle AHD Mobile DVR, Support SD card (not included) up to 128GB, and has built-in H.264 compression to keep files small. APPLIACTIONS: Specially designed for trucks, trailers, 18 wheelers, vans, buses and other huge vehicles. Install the device to your car by storing the DVR on the cars trunk and place upto 4 cameras on rear, windshield and dashboard.