Mpeg-4 image compression Adpcm audio compression Built-in web server, ie client support Max. 30fps image compression Max. 30fps image transmission D1, cif, field, qcif resolution Support ddns Support motion detection and watermark Support watchdog 30~50 meter radiation distance Support ccd scan mode Tcp/ip, arp, rarp, icmp, dhcp, ftp, http, and smtp protocol support Remote snap shot and video recording Self-contained ftp server & e-mail sending function Free multi-screen management software. Applicable indoor-outdoor installation Applicable in schools, banks, communications, posts and telecommunications, electric power system, video conference, high-class hotels, multinational enterprises, chain stores, home security etc.