Product picture - Meridian Technologies DigiFlex DR-4V 1D-2 Digitally-Encoded 4-Channel NTSC PAL Video with Return RS-232 Data Receiver Card Meridian, Technologies, DigiFlex, DR-4V, 1D-2, Digitally-Encoded, 4-Channel, NTSC, PAL, Video, with, Return, RS-232, Data, Receiver, Card Click the image to close this page