Image format: MPEG4 Resolution: Display: 720 x 480 (PAL), 720 x 576 (NTSC) Record: 640 x 224 (PAL), 640 x 272 (NTSC) ?Video input: BNC x 4 ?Video looping output: BNC x 4 ?Video output: BNC x 1 ?Display frame: 4 x 30 fields/sec.(PAL), 4 x 25 fields/sec.(NTSC) ?Recording frame rate (quad): max. 30 fps(PAL), max. 25 fps(NTSC) ?Recording frame rate (MUX): max. 30/4 fps(PAL), max. 25/4 fps(NTSC) ?Storage media: max. 2 IDE hard disks ?Image system: NTSC/PAL ?Compress rate: ?Low: 8k bytes/field Medium: 10k bytes/field high: 15k bytes/field Better: 20k bytes/field ?Playing back speed: frame by frame forward playback, fast forward x2, x4, x6, fast reverse x6 ?Alarm input: 4-input, programmable ?Relay output: NO or NC programmable contact x 1 ?Password control: one for HDD format ?Event list: 63 events/each HDD ?Power input: 12V DC ?Dimensions (W x H x D): 420 x 53 x 300mm ?Net weight: 5.5kg ?Operation temperature: -10 to 40deg. C ?Supports quad and multiplexer mode ?Real time display ?Manual/alarm/schedule recording mode ?Motion detection: yes ?Buzzer: yes ?Video loss: yes ?USB backup: yes ?Network interface: Ethernet ?Power input: DC 12V ?Dimensions(W*H*D) :420*44*290 ?Weight(KG):3.0