... DVR 2. Support SATA HardDisk,Mouse,USB*2,network 3. Audio, RS485, IE browse,15 languages 4.HDD,alarm H.264 ... ,1.0Vp-p,75Ω,1 VGA output(optional)Audio Input1 (could be expandedto 4channel)Audio Output1 channelAlarm InputN/A(could be expanded ...