1. H.264 Standalone DVR 2. Support SATA HardDisk,Mouse,USB*2,network ... H.264 main profile compression algorithm ideal for standalone DVR4 channels Realtime full D1 recording or 2 ... 2*USB 2.0 port for mouse,backup,DVD-RW,movable hard disk,upgrade etc ...Alarm triggering screen ... search / network alarm center functions, support WEB client, standalone client and SDKWith the sound system for the protection ...