4 channels IP NVR (expandable to 8 channels via switch DAHUA-1578). H.265/H.264. GPS, 3G/4G and WiFi module included. Playback up to 4 channels. Recording: 4K/8MP, 5MP, 3MP, 1080P, 720P, up to 200 Mbps. VGA output (aviation connector). Audio: 1 in / 1 out. Alarm: 6 in / 2 out. SD card slot. 2 USB, 1 RS485, 1 RS232. bus CAN and Gyroscope supported. Vibration tolerance. 6V~36V. switch PoE+ aviation connector.