Video input format: NTSC/EIA or PAL/CCIR Video input channel: four-channel composite Video output channel: one-channel composite Display frame: NTSC: 120fps, 4 x 30fps PAL: 100fps, 4 x 25fps Operating mode: quad mode or each mode; OSD (on-screen display), half duplex Recording frame rate: Quad mode: NTSC: 30fps maximum, PAL: 25fps maximum Each mode (maximum fps number of video sources): NTSC: 7.5fps maximum, PAL: 6.25fps maximum Video recording mode: quad/each Recording quality: high/medium/low selectable Resolution: Display: NTSC: 720 x 480, PAL: 720 x 576 Recording: NTSC: 320 x 112, 640 x 224, PAL: 320 x 136, 640 x 272 quad: 640 x 224 (total), each channel: 640 x 224 Compression format (each mode): modified MJPEG (12KB to 20KB/frame), low: 12KB/frame, normal: 15KB/frame, high: 20KB/frame HDD: built-in 40GB IDE ATA66 type (optional 80GB) Back-up (archive device): HDD (removable), VCR Search: Mode: time, date, camera F/screen: yes Sensor/alarm: 4 inputs, 1 output Security: password protection Motion detection: external IR or microwave sensor Power source:AC100V-240V, 50/60HZ Origin China Size 485 x 250 x 50 Millimeters Weight 3.5 Kilograms Packaging 1 Package Size 500 x 330 x 130 Millimeters Package Weight 4 Kilograms Delivery lead time 15 Minimum order 10 Supply ability 5000