... Network Digital Video Recorder 1.Support 2 USB DVR 2.PTZ, Audio, Network, 3.VGA 4.OEM CCTV DVR H. 264 Network Digital Video RecorderCCTV ... 16bit ADPCMAudio OutputRCA, 1 channelAudio InputRCA , 4 channels RCA , 1 channel(or 4 channels, option) HDD Port1 SATA port, ... FunctionsTCP/IP, PPPoE, DHCP , DDNSIE Remote Preview1/4 channels preview simultaneously Mobile phone live viewsupport(Iphone, Android, ...