... .H.264 DVR, 4CH video in 3.IE, mobile phone 4.PAL/NTSC, support 1 SATA 5.4CH playback,PTZ control ... Robustsecu R-D8104 4 Channels Digital Video Recorder R-D8104 4CH H.264 DVR ... , image quality and so on.Support 4 channel play back, synchronized playback at single channel, 2 channel or 4 channel A/V.Backup with USB, USB ...