Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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I've never yet known one that works via bluetooth? (Toys, possibly).
Bluetooth links add a slight delay to the audio, which generally makes it unsuitable for real-time / live audio.
A lot are wireless, but use dedicated FM or digital links. Many others are just conventional wired hand mics.
If they were bluetooth, that is a frequency-agile system; it coexists with WiFi an many other things in the 2.4 GHz band; it would be pretty much the last service affected by any kind of "jamming" device.
[Plus deliberate interference is criminal, in most countries].
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