The SKM COM with the push button adds additional functions to the SKM.
To attach the SKM COM:
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Switch off the SKM.
The SKM must be switched off before the SKM COM is attached or removed.
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Place the SKM COM on the SKM so that the push button is positioned above the display.
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Tighten the 3 screws evenly by hand using the supplied angle screwdriver.

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Screw on a compatible microphone module.
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Do not touch the contacts of the microphone or the microphone module. You might contaminate or bend them.

The SKM COM is attached to the SKM.