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What's the operating range on Bluetooth earbuds these days? On reasonable ones, not the cheapest and not the most expensive? (I'm not looking to buy any exactly, but am curious.)

Also I know some things affect radio signals, so what's a definite BT signal killer? I know an electric kettle makes the WiFi dip in latency and a friend always dropped out of VOIP chats when using the microwave, but are there actually known and verified things that do this?