The CRM 100N-RF is a low profile retractable through table boundary microphone with omni-directional polar pattern in satin nickel. Designed for simple installion with professional sound response. For use in conferencing or security situations. The microphone has a unique ability to retract and lock the capsule module away from sight leaving only 3 mm (0.12”) protruding on top of the table. The microphone is of a robust brass construction and include 2 Metres (6.6ft) of cable. The microphone includes an integral phantom power module which is to be powered by 9 to 48 volts. The phantom power module also includes filters which will eliminate all GSM frequencies from 800-1200 MHz.