... 2. Free built-in DDNS 3.Motion detection 4.remote software upgrade 5.2 years warranty Weekly promotion- ... h.264 4 channel cctv dvr recorder network(D2804S1). 1. ... H.264 Main Profile Compression2. 4 channel real time recording, 4 channel real time synchronous playback3. Free ... protocols: SMTP, UPNP, DDNS, PPPOE, etc.VideoInputBNC×4,(1.0Vp-p,75Ω)CVBS OutputBNC×1,(1.0Vp ...