Low profile back electret Boundary Layer Condenser Microphone for use on large surfaces walls, floors piano etc. Omni-Directional Polar Pattern in Nextel Grey. Designed for easy use on large surfaces in a wide range of professional sound situations. Ideal for mounting on walls, floors, piano etc. The hemispherical Polar Pattern provides natural sound with a good sense of depth for optimum bass. 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 Grey.