Microphone dynamic compact `` MDM-1 ''.

Microphones.MicrophonesMicrophone dynamic small-sized "MDM-1" was produced presumably since 1957 by the Odessa plant "Red October". The microphone is intended for use in household sound recording. The nominal operating sound frequency range is 100 ... 5000 Hz. Uneven frequency response 12 dB. Output impedance 3 kOhm. Sensitivity 2.5 mV. Unidirectional. Microphone dimensions 67x98 mm. Weight 800 gr.