1080P*4CH, RS422, PTZ, Alarm, Network; 2 SATA HD, HDMI, VGA, USB Backup, USB Mouse ModelHD-3104HCompression FormatH. ... Operating SystemUser Interface4-bit true color graphical menu, support for USB mouse operation, with menu notesPreview resolution1920x1080( NTSC ), 1920x1080 ( PAL );Real ... CWorking Humidity10%--90%Dimension440mm×420mm×90mmPackage47*45*45mm, 4PCS/CTNWeight10Kg HD-SDI 4 CH DVR ...