RTS MCP90-18 Panel Mount Gooseneck Microphone for Telex Intercoms - 18"The Telex MCP90 is a gooseneck electret condenser microphone, designed for front panel connection to that company's RTS, and several Audiocom, wireless or wired intercom main stations. The wide frequency response and cardioid pickup pattern of the MCP90 allow for optimal speech intelligibility and minimal ambient intrusion. The unique, custom threaded 1 4" TRS connector allows the microphone to be secured in a screw like fashion to a main station