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 DVR 4 channels ... ,50 f/s;NTSC 525 line,60 f/sVideo CompressionH.264 main profileVideo RecordingD1 : PAL 1f/s-25f/s NTSC 1f ...