The DVR-PRO16 digital video recorder has an embedded Linux OS for stability and features a 120GB hard drive with upgrade capacity to 1 terabyte for recording up to 16 cameras. • MPEG4 video compression provides longer recording capability. • Embedded Linux OS allows HDD hot swapping and can automatically detect, initialize, and format additional drives. • Controls PTZ (Pan, Tilt, and Zoom) cameras in realtime with full 480 fps (frames per second) display. • PSTN, LAN, or Internet connection allows remote site display, control, playback, and simultaneous multi-user remote access. • Windows-like GUI (graphical user interface) is easy to use • Can display up to all 16 channels on one screen.