ONE channel video and data,two way talking,software support. H.264 compression algorithm for network transmission Real time live network display, multiple level image resolution supported: D1/ HalfD1/ CIF/ QCIF MP3 audio format with mono or stereo for your option. Self-adjustable frame rate to fit the network bandwidth. Powerful alarm function supporting video motion, video mask, sensor alarm, etc. RS-422/485 port for virtual serial port transmission, PTZ, Speed dome camera control etc. Two-way talk real time. Windows Media Player to play the recording data. Dynamic IP address supported, LAN & Internet (ADSL, PSTN, ISDN, etc) Built-in web server to access the web page remotely with IE browser Abnormality recovery automatically, support auto-reconnection when there's network break. Multiple users can access it simultaneously, multi-grade password protection. Networking access for remotely live viewing, recording, playback, setting, etc.