... synchronized playback at single channel, 2 channel or 4 channel A/V. Backup with USB, USB HDD, CMS and IE.Support ... , Polish, Korean, Greek, Indian, Czech, Vietnamese, etc.R-D8104A PTZ control H.264 network function 4CH DVRItemParameterCompression standardsH.264Video InputBNC (1 ... 340 x 248 x 68 mmRobustsecu R-D8104 H.264 NETWORK 4CH DVR Robustsecu R-D8104A PTZ control H.264 network function 4CH DVR