Listed on Amazon as: “VicTsing Portable USB Bluetooth Audio Music Streaming Receiver Adapter with 3.5 mm Stereo Output Black”
This is a tiny USB adapter. On top is a single 3.5mm 1/8inch stereo output. You can connect headsets or you can plug it in your car stereo. It is powered directly by USB. There is no battery inside.
It can be left connected in your car.
I was able to just plug it in my car’s USB power and then on my phone, I just scanned for Bluetooth devices and tap BT-810 once. It was connected as the default audio output.
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