Product picture - Meridian Technologies DigiFlex DR-4V2A2D 2A2D-2 4-Channel NTSC PAL Video, 2-Channel Bidirectional Audio and 2-Channel Bidirectional RS-232 Data Receiver Card Meridian, Technologies, DigiFlex, DR-4V2A2D, 2A2D-2, 4-Channel, NTSC, PAL, Video, 2-Channel, Bidirectional, Audio, 2-Channel, Bidirectional, RS-232, Data, Receiver, Card Click the image to close this page