Linux Operating System9 channel looping, BNC4 x Audio Line in, 1 x Audio line outComposite output (702 x 576 PAL)9 x TTL alarm I/P, 9 x TTL O/PUp to 100 ips @ 1 CIF SimplexMonitor out: Composite:1 BNC, SVHS:1 Y/C, VGA:1, Spot:(composite)4xBNCRecord Resolution: 1 CIF @ 336 x 272, 2 CIF @ 672 x 272Built in CD-RW250 Gig HDD standard + optional 2 extra HDDSecondry Storage: Int CD-RW, USB HDD, USB CD-RW, USB memory stick SCSI HDD (RAID)RS-232C, RS485, Serial Ports3 x USB (2.0) ports, includes mouse supportLAN (10/100 Base Ethernet) Standard RS-232C for ext. Modem1 x Remote Controller- IR Port240 VAC operation