Operating System: Embedded Linux System  Menu Display: 1/4 Screen  Video Compression: H.264  Record Resolution: 1080P  VGA Resolution: 1280*1024, 1280*800, 1024*768  Frame Rate: 1-25fps  Max Synchronous Playback: 1-ch 1080P  Code Capacity: 4*1080P/960P/720P  HDD Supported: Max. 3.5in 3TB SATA HDD (not included)  Dual Stream: Support; Video Blind: Support  Online User: Max. 8  OSD Language: English, French, German, Spanish, Italian, Japanese, etc