High stability----absolute Hardware compression and the professional embedded operating system RTOS , completely divorced from PC, can avoid virusinfraction once for all. Top advanced algorithm---- H.264. Adopt G.722 compression format for high quality audio. Each channel compresses the signal at real-time individually. IDE interfaces support the HDD of any capacity. Provide the customers with the powerful client SDK, enables the user implement the second development based on their own requirements. At accidental condition, watchdog can restart the system less than 10 seconds to shorten the non-work time. An Ethernet interface, support PSTN, ISDN, ADSL, LAN and WAN. Support PAL and NTSC systems, the Max real- time resolution can reach 704*576(320-550 TVline).Record resolution is 352*288(220-320 TV line) line) Multiple languages available for on-screen menu. -Support the alarm of video-lost, motion detection and sensor. Support the local backup and network backup. Powerful HDD error correcting ability enables DVR to continue working while fault occurs.