Dvr A.H.264 video and oggvorbis audio compression technology B. Pal / ntsc supported C.4, 8, 16 video channels with inputs looping D.Full cif per input E.1 bnc connector for analog monitor outputs and 1 vga video output, 1 usb port F. Up to supports 16 alarm inputs and 4 alarm outputs G. Up to 4/8 sata hard-disks (additional ordering) H.Privacy masks and multi-area motion detection I. Supports video mask, video lost, motion detection, associated alarm J. Provided monitor alarm, audio alarm, upload control centre, transmits alarm signals thru the network. K. Supports manual record, timing record, motion detect record, alarm inputs record L.Support alarm pre-record and alarm relay function M. Adjustment of resolution, code flow, frame rate and image quality N. Search the record files according to the time, channel no. And record type; provided forward , backward, frame play modes etc. O. Simultaneously records, transmits and displays live video while searching for and archiving video P. Tcp/ip, udp, pppoe, dhcp, ppp etc. Q. Supports bi-directional audio between the monitoring centre and the local site (intercom) R. Ptz control S. Multiple handles for exceptions: hard disk error, hard disk full, not standard, unauthorized access, network disconnect the alarm T. Provide second level authority control in local site U.Downloadable upgrades for products updating through usb V.Client software has almost all the local features, including real-time all the way to any video signal to view the video equipment, and set parameters, ptz control, remote video file search, download and playback functions, etc.