... users network view simultaneouslySupport Dual-stream. Support SMTP, UPNP, DDNS, PPPOE, etc, protocols.Support sending alarm information and picture by E ... linkage when external trigger alarmSix workers at the same time support the operation of preview, recording, playback, network transmission, backup ... *260*50mmWeight(without hard disk)2.6KG 4CH dvr cctv surveillance /cctv dvr recorder(D7104A-U)