Product picture - Meridian Technologies DigiFlex DR-4V4C4D 4C4D-5 4-Channel NTSC PAL Video, 4-Channel Bidirectional Contact Closure, and 4- Channel Bidirectional RS-232 Data Receiver Card Meridian, Technologies, DigiFlex, DR-4V4C4D, 4C4D-5, 4-Channel, NTSC, PAL, Video, 4-Channel, Bidirectional, Contact, Closure, 4-, Channel, Bidirectional, RS-232, Data, Receiver, Card Click the image to close this page