... network(D2804S1). 1. H.264 Main Profile Compression2. 4 channel real time recording, 4 channel real time synchronous playback3. Free built-in ... DDNS, easy to access the network4. Support mobile phone surveillance: I Phone ... : SMTP, UPNP, DDNS, PPPOE, etc. VideoInputBNC×4,(1.0Vp-p,75Ω)CVBS OutputBNC×1,(1.0Vp-p,75Ω),PAL 704*576,NTSC 720 ...