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Electret microphone "FEM-9" was produced since 1985 by the Tula factory "Octava". Produced in two versions: "FEM-9" - designed for sound amplification systems, has a balanced output. "FEM-9A" - is intended for a complete set of household recording equipment, has an asymmetrical output. Microphones have a low susceptibility to interference. The frequency range is 50 ... 15000 Hz. Sensitivity 4 mV / Pa. Unevenness of the blackboard 18 dB. 300 Ohm electrical resistance module. Microphone dimensions are 51Ñ…173 mm. Weight 270 gr.