Specifications of the NEC screen approximately 50 inches. It does not accept an HD cable unless an adapter from HD to color wires is installed.... Display Ports (Video Inputs): It contains multiple ports including a blue VGA port, a digital DVI-D port, in addition to professional BNC ports and Composite (AV) and S-Video ports. Control and Institutional Control: It contains RS-232C serial control ports (In/Out) for remote control of the screen via devices and computer systems. Audio Outputs: It contains direct external speaker wire terminals (Speaker L/R).