... network, two-way audio,Alarm, VGA;2. Support mobile phone live preview via GPRS/CDMA/EDGE/3G/WIFI net; ... multi-screen real-time preview, settings, backup and playback video through IE; CCTV DVR Specification: BCS6504BCS5304Video CompressionH.264Video Preview ... , DHCP , DDNSIE Remote Preview1/4 channels preview simultaneously Mobile phone live viewsupport(Iphone, Android, Symbian, Blackberry, WM, etc.) ...