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Headset microphone for speech amplifiers. Models for Rand Voice Amplifier (see separate entry) and Voicette Amplifier (see separate entry). MS40 4 Models has 3000 ohms microphone impedance and 1.155 mV microphone output level. Headband with microphone and acoustic tube attach to either side of band. Acoustic tube and microphone can be attached directly to glasses. Voicette has on/off switch on cord, Rand has on/off switch on circuitry pack. Both models can have higher quality microphones substituted for standard microphone.
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