The C 33ES/SR-RF is a semi rigid gooseneck cardioid microphone fitted with silent operation reed switch and micro LED indicator. It is designed for use in conference halls, places of worship, broadcasting and paging systems. The Electret condenser gooseneck microphone has a cardioid polar pattern and slimline profile design. The microphone is constructed from high quality brass construction using 8mm semi-rigid shaft. A reed switch is incorporated to facilitate pop / click free muting of a microphone. The microphone is fitted with a phantom power adaptor accepting 9 to 48 volts DC and has an impedance of 200 Ohms. The phantom power adaptor also includes filters which will eliminate all GSM frequencies from 800-1200 MHz and is terminated with a male 3 pin XLR.