Product Type: One channel: 25 frames per second. Playback resolution: 704x576 Two channels: 50 frames per second. Playback resolution: 352x288 up to 704x576 for one channel Four channels: 100 frames per second. Playback resolution: 352x288 up to 704x576 for one channel The GPRS/GSM Mobile DVR is specially designed for Vehicle surveillance and entertainment. Mini-size make them to be convenient to take, installing is simple. Key Features include: Wide range working voltage, from DC8V to DC40V, and supply DC12V for camera. Playing DVD resolution?s program meanwhile Monitor and Recording. Lot?s of recording mode such as (opening door or closing door) alarm recording, motion detection recording, manually recording and so on. Routine and vehicle number storage function. Vehicle Speed, turning direction and brake event storage function . Vehicle location reporting, SMS or MMS alarm via GPRS/GSM, and remote control (Optional). Voice bus stop report (Optional). To be convenient backup from CD_ROM to Hard Disk or from Hard Disk to CD_ROM. Network interface, PTZ controller. Recording Clips lock function. Support English, Traditional Chinese and Simple Chinese Menu. Electronic Anti-Vibration and second Mechanical Anti-Vibration design. Special Hard Disk install mechanic, make mounting and unloading Hard Disk very easy. Dimension : 240mm?195mm?91mm