Motorola XPR 4550 Desktop Microphone Button Left and Right

Motorola XPR 4550 Desktop Microphone Button Left and Right

My question is: The RMN5050 microphone I'm using for the radio has two buttons on it. The right-side "lightning bolt" button is the PTT button to transmit, but I can't figure out what the left-side "speaker icon" button does. When I try to push it, nothing appears to happen.

Does anybody know what the purpose of the left-side "speaker icon" button is?

See below for an image of the Motorola RMN5050 microphone I'm using:

Answer:
Its to monitor the channel/Frequency PRIOR to transmitting....as required by law....although today the way radios are programmed its kinda moot

https://motorolamic.blogspot.com/


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