Product picture - Meridian Technologies DigiFlex DXA-1V1A1K-2 Bidirectional 1-Channel 7 MHz NTSC PAL Video, 1-Channel Balanced Audio, & 1-Channel 4-Wire RS-485 System Transceiver Card Meridian, Technologies, DigiFlex, DXA-1V1A1K-2, Bidirectional, 1-Channel, 7, MHz, NTSC, PAL, Video, 1-Channel, Balanced, Audio, &, 1-Channel, 4-Wire, RS-485, System, Transceiver, Card Click the image to close this page