Product picture - Meridian Technologies DigiFlex DR-1V4F 4F-2 1-Channel NTSC PAL Video with 4 Bi-Directional RS-422 Data System Receiver Card Meridian, Technologies, DigiFlex, DR-1V4F, 4F-2, 1-Channel, NTSC, PAL, Video, with, 4, Bi-Directional, RS-422, Data, System, Receiver, Card Click the image to close this page