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The electret microphone of the type "FEM-271" has been produced since 1986 by the Vitebsk software "Monolith". Semi-professional unidirectional microphone. The frequency range is 20 ... 20000 Hz. Sensitivity 2 mV / Pa. Non-uniformity of the CX 14 dB. Output impedance is 100 ohms. Dimensions of the model 25x205 mm. Weight with a cable 240 gr.