MPEG4 video compression, provide high compression rate, save hard disk space; Totally independent from PC platform, easy to operate, no virus infection Real-time; 25 frames/s; Four video channels input, two video channels output 2 channel of audio input, 2 channel of audio output. Support TCP/IP agreement, support USB backup (optional) Video yard flows / frame rate is adjustable; Possess the double function :video and playback can go on at the same time Equipped with remote devices，can completely replace professional control keyboard Possess outage automatic protection function, Energize and start the function automatically; Tabular inquiry, time inquiry. many kinds of enquiries way Support 300G more than large hard disk Item