Here's a data point for you.
Friend of mine has one of these things. I'm non-physical myself (see my introduction, I have someone who lets me borrow their hands to type here), so I thought I'd give it a try and see what I could do. I figured the most clear thing I could possibly do was to say my name over and over rather than something generic like "hello."
Worked great. My name comes through at least a half dozen times in the recording.
So yes, they work, if they're the kind that actually uses radio frequencies, not the phone app kind.
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