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17ms or more 1 warning signal input, TTL active low or make contact, pulse-width more than 100ms RS-485, half-duplex asynchronous 6P terminal block, transfer speeds: 9600, 19.2K, 38.4K (bps)_ Hardware Embedded OS Internal 120 gigabyte hard disk drive (upgradeable to 240GB) 1 removable hard disk (optional) Electrical Power source 108-132 VAC; 60 HZ Power consumption Max. 50W Environmental Key Features and Benefits 1 video channel input Simultaneous recording and playback Removable disk