My powerbeats neckband doesn't work properly with the integrated bluetooth in iMac 27" late 2014, so was looking for a bluetooth 5 dongle. but couldn't find any that has macOS support. If anyone could recommend one, that would be great! 
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Bluetooth 5 Adapter / Dongle for iMac 27" late 2014 (big sur)
- Thread starter audacioustux
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Well, I don't own one, one on Amazon claims Mac compatibility.
Amazon Link
Amazon Link
@audacioustux curious your results on this? I've noticed similar issues with my same iMac 27" with degraded audio quality which I think is the device connecting at the lower BT rate. Did this work and did you notice improvement with audio quality?