Features: @H.264 hardware compression. realtime Video&Audio synchronous monitor and record. @D1 (4CIF) high quality image playback. @4 channels fast search and playback @Easy record backup to USB device @IE remote access and control. @Bi-direcrional remote voice talk @Support multi-zone motion detect, privacy mask, video lost alarm, positioning OSD, multi-level user management. @Alarm auto report to center (ILDVR CMS or Live Center) Specifications: Compression :H.264 (Hardware support) Video Output :1 channel BNC, 1 VGA(800*600,1024*768,1280*1024,1440*900,1600*1200,1680*1050,1920*1080) Audio Output :1 channel RCA Video Input :4-channel BNC Audio Input :4-channel RCA Preview Resolution :PAL: 704x576(D1), NTSC:704x480(D1) Playback resolution :D1/Half D1/CIF: Total 120fps@CIF or 30fps@D1 Frame Rate Range :PAL: 1,3,6,12,25 fps and user self defined. NTSC: 1,3,6,12,30 fps and user self defined. Bit Rate Range :32Kbps to 2Mbps, self-defined. Stream Type :Video & Audio / Video Communication Interface :1 RJ45 (10M/100M), 1 RS422 External Alarm In :4 Relay Output :1 Dual-Stream :Yes Voice Talk :Same as audio input and audio output HDD Interface :1 SATA (maximum 2000GB) USB Interface :2 USB Power Supply :DC 12V/3A Operation Temperature :-10°C ~ 40°C Operation Humidity :10% ~ 90% Dimension :340mm x 270mm x 55mm Weight :1.8 kg (without HDD)