1080P*4CH, RS422, PTZ, Alarm, Network; 2 SATA HD, HDMI, VGA, USB Backup, USB Mouse ModelHD-3104HCompression FormatH.264Operating ... by MobilephonePower Source12V/5AWorking Temperature0°C--+55°CWorking Humidity10%--90%Dimension440mm×420mm×90mmPackage47*45*45mm, 4PCS/CTNWeight10Kg HD-SDI 4 CH DVR ...