The ARM 100N-RF is a low profile through table boundary microphone with Omni-Directional Polar Pattern in Satin Nickel. The microphone has a unique ability to automatically extend and retract and lock the capsule module away from sight leaving only 3 mm (0.12”) protruding on top of the table. The microphone has an inbuilt motor that is operated by a control box ARM – C. Control signals (+2.5V to +12V) from a DSP or electronic switch are required to activate the motor. The microphone is of a robust brass construction and includes 2 Metres (6.6ft) of audio cable and 2 Metres of control cable. An integral phantom power module is provided requiring 9 to 48 volts dc. The phantom power module also includes filters which will eliminate all GSM frequencies from 800-1200 MHz. Must be used in conjunction with ARM-C control box and DSP or electronic switching box.