The CS1-RF is a boundary layer microphone developed to minimise the number of microphones on the conference table while maintaining high performance and ease of installation. Boundary Layer Microphone with a half cardioid polar pattern. Designed to be placed in the middle of the conference table, with the participants facing the condenser element. The design accommodates both side and bottom cable exits which means it can be used for either mobile and permanent applications. Inbuilt Phantom Power Module. The microphone is be made from solid brass, and capable of being permanently mounted with the use of an M 10 x 1 hollow bolt, nut and washer. The microphone includes a 6.6 ft (2 metre) cable with open-ended termination. Also include is an integral phantom power adaptor PPA-RF which accepts 9 to 48 volts DC. The phantom power adaptor includes filters which will eliminate all GSM frequencies.