The CS 4-RF is a boundary layer condenser microphone with a half cardioid polar pattern satin nickle. It minimise the number of microphones on the conference table whilst maintaining high performance and ease of installation. It Designed to be placed in the middle of the conference table, with the participants facing the condenser element. Can be permanently mounted using the hollow bolt and nut provided. Inbuilt Phantom Power Module. The microphone is made from solid brass and capable of being permanently mounted with use of an M 15 x 1 hollow bolt and nut. A 6.6 ft (2 metre) cable is provided with open-ended termination. Included are four integral phantom power adaptors that accepts 9 to 48 volts DC. The phantom power adaptor also include filters which will eliminate all GSM frequencies from 800 MHz - 1.2 GHz.