Features Specifications:Sell H. 264 SATA HDD digital video recorder  Technical Guidelines: Parameters of video Video input: PAL, NTSC  4 channels composite video input(BNC port,1VP-P,75ohm) Video output: PAL, NTSC  A composite video output(BNC port,1VP-P,75ohm) A VGA output(frequency:60-85HZ,resolution ratio:480*320-1024*768) The quality of the record: There are 12 in all, from high to low   Operating system: Embedded real-time operating system (RTOS) Network port: Adaptive Ethernet port of 10M/100M HDD: Support 4 SATA Series port: RS485 Backup: SATA, Network Power supply: 220+- 30% V, 50+- 3% HZ Working temperature: -10 to 55 Working humidity: 10%--90% Power consumption (without hard disk): 20W  Dimension: Width 440mm, depth 435mm, height 96.6mm