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The KMS-7 radio microphone has been mass-produced since the beginning of 1966. The microphone is designed for wireless voice transmission of a lecturer, singer, speaker, etc. It consists of the microphone itself, the transmitter and the receiver. The microphone provides a frequency band of 100 ... 8000 Hz. The range is 50 ... 150 meters. The duration of the continuous operation of the KMS-7 microphone from batteries is ~ 30 hours.