Product picture - Meridian Technologies DigiCool FR-1W1A2C 1A2C-2 1-Channel NTSC PAL Video with 1-Channel Bidirectional Audio & 2-Channel Bidirectional Contact Closure System Receiver Card Meridian, Technologies, DigiCool, FR-1W1A2C, 1A2C-2, 1-Channel, NTSC, PAL, Video, with, 1-Channel, Bidirectional, Audio, &, 2-Channel, Bidirectional, Contact, Closure, System, Receiver, Card Click the image to close this page