Top advaced arithmetic H.264 (MPEG4 Part 10)Video comprssion Powerful chipest adopt Philip-Trimedia Chipset that has 16DSP. One DSP deal with one channel. High stability: absolute Hardware compression and professional embedded operating system. Real time: up to 16ch vido and audio synchronized display and record real time. Perfect image: 8 grade image level from 32k to 1152k. It can satisfy with low bit rate for network transmission. And also for suitable bit rate for high image recording. Good network transmission: It can transmit on PSTN, ISDN, ADSL, WAN, LAN Built-in 8 HDD: for industrial configuration. Don't pay any money on Disk Array. Individually working: Each channel compresses the signal at real-time individually, the parameters of resolution, frame, and record time can be set up separately. Support real watermark technology so that compressed image file cant be juggle