4ch Camera Input;Compression ratio:latest H.264Video;single system Insert 6 cards in your PC at most;low occupation of CPU resource and small HD space,about 30-150M/ch/h;support dyanmic IP by dynamic domain name;support multi-channel real-time view/playback by IE browse;the customer can support 16ch real-time video display at most;display resolution:704x576;support watermark technology;