Product picture - Meridian Technologies DigiCool FT-IS-RCU-2ST 1-Channel Bi-Directional Audio Transmitter for Aiphone IS Series CCU & RCU Door Station Meridian, Technologies, DigiCool, FT-IS-RCU-2ST, 1-Channel, Bi-Directional, Audio, Transmitter, Aiphone, IS, Series, CCU, &, RCU, Door, Station Click the image to close this page