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Key Specifications: * Video input: 4 channels (BNC) * Audio input: 4 channels* Video total frame rate: 100 fps in PAL, 120 fps in NTSC* Compression Arithmetic: H. 264 optimize arithmetic* Display resolution: 640 X 480, 352 X 288, 320 X 240* Compression ratio: average 150M / C / H* Network protocol: TCP / UDP* Operating System: Windows2000 / XPFunctions: * 4 channels real-time audio & video monitoring* Continuous, motion-detection, alarm and scheduled recording* Support motion detection touch off the video recording, sending E-mail (monitoring pictures in the enclosure) , sending alarm by phone, and by sound. * Support multi-hard disks cycle recording* PTZ and preset point control* Intuitionisticly display historical recording file by graph, up to 16 screens playback* Electronic enlarge, screenshot, and timely printing picture* Support to backup the video file in DVR or exe format, you can play the DVR file directly and no need to install any player. * Multi-user's authority management