English term
France
priority:accuracy
Native in: French 
Works in: Japanese to French, English to French, Spanish to French, and 1 more.
audially
PRO (1): Tony M
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Discussion
"In the microphone that is used as the audio detector, the sound waves cause mechanical movement of the diaphragm at audio frequencies"
It isn't "called as a mechancial voice device", and I can't even begin to imagine what they might have been trying to say, so I suggest you leave that bit out.
You really ought to tell your customer that this text is untranslatable as it stands, and try and get hold of the text in its original language. This reads to me more like a bad translation than a poorly-written text, so with any luck, the source language might exist ;-)