Karl Storz AIDA WD 300 System Description page 57

Operation
Suppressing audio recording
a
1. Tap on the microphone icon a.
$ The Microphone operation field opens.
2. Place a check mark next to Mute.
$ The microphone icon turns orange.
3. Tap on the operation field again to close it.
$ The microphone icon will appear with a strike-through line across it.
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KARL STORZ AIDA ®