... HDD, Max 2048G 4-CH Alarm input DVR, Stand alone DVR, Network DVR Main Features1. H.264 ... . Support USB2.0 interface to stably achieve amount of operations such as using USB mouse, backup, burning ... WINDOWS, which has powerful function of mouse’s right button menu making it easy to use6. Powerful network ... Users can check the earlier working status of the DVR by this. DVR, Stand alone DVR, Network DVR