The C009E-RF is a low profile back electret boundary layer condenser microphone for use on large surfaces walls, floors piano etc. Omni-Directional polar pattern in nextel black. The Microphone is made of a robust steel construction and includes 10 ft (3 metres) of cable. The Microphone includes a separate in line phantom power adaptor which is to be powered by 9 to 48 volts. The in phantom power adaptor includes filters which eliminate all GSM frequencies from 800-1200 MHz. Total Harmonic Distortion (THD) at an operating level of 120dB is no greater than 1%. Finish:Nextel Black.