My IOGEAR Bluetooth 4.0 USB Micro Adapter (GBU521) worked fine with my Plantronics Back Beat Pro 2 sonically (it was as good as the BT600), but I couldn't get the Plantronics headset media remote (stop, start, back, forward) to work on my Windows 10 PC. With the BT600, the control works in most cases, at least at close range. However, the BT600 does not show up as a Bluetooth device in Windows 10, but under Sound, Video and Game Controllers. Plantronics Hub and the comments here suggest it should work like a regular BT adapter, but so far it hasn't worked. Part of "you must be joking" is that you have to press a button on the BT600 for it to pair. Trying to do this after plugging it into a USB socket on a loaded PC (many other things plugged in) under a table was half fun and downright frustrating.
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