... Specifications of H.264 CIF Realtime dvr recorders> Up to 4/8/16 cameras with SXGA(1280×1024) display > H.264 dual-stream video compression > ... , camera blank, video loss > 3D intelligent positioning with sectec PTZ dome camera > Easy backup: USB devices, network download > Support ... 1 SATA HDD, 2 USB2.0 > Built-in web server, multi-DVR client, DMSS ...