H.264 compression,4 channel standalone dvr,support SATA HardDisk, Mouse,USB,network ... 3G supportNetwork Viewer:• Static, Dynamic IP and DDNS , Support Internet Explorer and special client software• Remote Live Monitoring, file searching ... ,50f/s), NTSC(525Line,60f/s)Video Input4 channel, BNC , 1.0V p-p/75ΩComposite Video ... , 1.0V p-p/75ΩMonitor Video Output1 channel, BNC, 1.0V p-p/75ΩVGA Interface1 VGA ...