Kramer Electronics VP-23XL VP-23xl is a 4x1 composite video, a 4x1 s-Video (Y/C) and a 4x1 computer graphics video switcher each with balanced stereo audio. It is designed for a wide variety of presentation and multimedia applications. High Bandwidth - 315MHz (-3dB) computer graphics video, s-Video (Y) 260MHz (-3dB), 470MHz (-3dB) composite video. HDTV Compatible. Audio and Computer Graphics Video Level (Gain). Controls. Microphone Input Level Control. Master Audio Output - Input selectable. Talk Over Button - Microphone input signal mutes the line Audio output when a microphone detects sound. Control - Front panel, RS-232 (included KRouter Windows - based software), and IR remote (included). Standard 19inch Rack Mount Size - 2U.