1. H.264 Standalone DVR 2. Support SATA HardDisk,Mouse,USB*2,network ... . Audio, RS485, IE browse,15 languages 4.HDD,alarm H.264 main profile compression algorithm ideal for standalone DVR4 channels Realtime ... ,50 f/s;NTSC 525 line,60 f/sVideo CompressionH.264 main profileVideo RecordingD1 : PAL 1f/s-25f/s NTSC 1f ... ) * 58MM (highly)Weight2.38KG 4CH Full D1 Real Time H.264 CCTV DVR