Professional Mobile DVR supplier.Compression: H.264 main profile,4 channels CIF,HD1,D1 recording , 4 channels CIF,HD1,D1 playback, up to 390 frames CIF/s(NTSC) ,4 channel real-time recording.Embedded Linux system, Double MCU control. Video input/output: 4 channels input & 1 channel outputAudio input/output: 4 channel input & 1 channel output (can be turned off) Storage: Support 1TB max and 1SDcard(storage parameter, not available now)G-sensorBuilt Model: GPS(Selectable) :3G(HSPA/WCDMA/EVDO)