Signal system: PAL/NTSC Video input: 1.0V p-p/75Ohm, BNC, 4 channel /8channels / 16channels Video output: 1.0V p-p/75Ohm, BNC, 1 channel Audio input: -8Db 22kOhm, RCA, 4 channel / 8 channels /16 channels Audio output: -8Db 3kOhm, RCA, 1 channel Alarm input: Open circuit / close circuit alarm, photoelectrical isolation protection, 4/8/16 channels input Alarm output: Relay isolation node output, open circuit or close circuit optional, node capacity 250V/5A, 2 channels Network interface: 10/100M Base-T, Ethernet interface Resolution: Image: 704X576 1 channel, 352X576 2 channels, picture in picture, 2 pictures, or 1 picture, 352X288 4 channels, can be 1 picture or 4 pictures display Recording frames: 4 channels 100 fps /8 channels 200 fps /16 channels 400 fps HDD: 8 internal hard disks (maximum 250G) Power consumption: 150W Network functions: Backup, browse, and control thru LAN; Browse via IE; Backup speed faster than USB Connection to external hard disk: IDE port directly to external hard disk for backup, Pan lens control, remote operation, alarm signal, motion detection, VGA output(Selectable), etc. Operation mode: Remote control Operating temperature: -10Centigrade50Centigrade; Humidity