ePathChina 4 Channel H.264 Audio Video Security Surveillance Network Realtime High Resolution DVR Recording System With Remote Control And Built In 500GB Hard Disk Embedded LINUX Operation System, Support Synchronous Multichannel Recording, CIF Code Real time Playback, Support for DHCP and PPPOE to Connect LAN or Internet This DVR Lets You Have Up To 4 Security Cameras ( NTSC) Setup Around Your Premises,The Dual Stream Function Allows Two Users To View The Video Simultaneously, One In Front Of The Monitor, and One Over The Internet. 4 Channel H.264 Network Digital Video Recorder System Featuring Cutting Edge Dual Stream Technology Which Allows You To Monitor Your Home or Business, Record High Resolution Videos and Be Able To Smoothly View Them Over Internet. In Addition, This DVR Records Video Continuously Even When You Are Viewing Videos In Playback Mode, keeping A Close Eye On Your Properties Anytime, Day And Night. With Support For DHCP and PPPOE, It Is Possible To Connect The DVR Security System To Your LAN or Even The Internet. 4 Channel Simultaneous Recording/Viewing, 500GB Free HDD Included, Motion Detection / Alarm Detection, H.264 Video Compression, Support Remote Access Through LAN or WAN.