Sennheiser SKM 500 Instruction Manual page 11

Putting the radio microphone into operation
Do not touch the contacts of the radio microphone
nor the contacts of the microphone head
contacts can become dirty or damaged if touched.
When unscrewing the microphone head
operation, the muting function is automatically acti-
vated. "MUTE" appears on the display panel.
When screwing the microphone head
radio microphone, the muting is canceled. "MUTE"
disappears from the display panel.
Screw the desired microphone head to the radio micro-
phone.
The radio microphone is operational again.
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