I've used a lot of Drok products and while they're not the best on the market they're excellent value for money. I built a ghetto blaster at work that allowed me full use of Bluetooth. The voice that comes out when connecting can be removed and a chirp or ring can be used instead, but that's a minor downside, English is terrible. Now all you need is a way to turn it off when the main power is off on the other board.
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