Product picture - Meridian Technologies DigiFlex DR-4V4A-3 4-Channel NTSC PAL Video Multiplexer with 4-Channel Unidirectional Audio System Receiver Card Meridian, Technologies, DigiFlex, DR-4V4A-3, 4-Channel, NTSC, PAL, Video, Multiplexer, with, 4-Channel, Unidirectional, Audio, System, Receiver, Card Click the image to close this page