Looking for an easy to install Bluetooth USB dongle for your Mac or Hackintosh PC — I recommend the Broadcom BCM20702 Chipset. It’s readily available used by many dongles, inexpensive and works easily without drivers. But you need to install some software just to enable it.
Just got the GMYLE Bluetooth 4.0 Dual Mode Micro USB Broadcom BCM20702 Adapter Dongle, US $8.98 inc postage from eBay claims to work with: MacBook Air Late 2010 and later, Mac mini Late 2009 and later, MacBook Late 2008 and Later, MacBook Pro 13' Mid 2009 and later, MacBook Pro 15' Late 2008 and Later, MacBook Pro 17' Early 2009 and later, Retina MacBook Pro Mid 2012 and later, Mac Pro Early 2009 and later, iMac with Broadcom Wi-Fi chip Late 2009 and later) Works perfectly with no configuration with my Mac mini (Mid 2010) El Capitan, so I'm inclined to believe the above compatibility list. Hello, I am actually using the Cambridge Silicon Radio CSR8510 A10 dongle with my Mac Pro 2010 and it works great, although the range is not very impressive. I also know that a colleague of mine is using the Broadcom BCM20702 for his MacBook and supposedly it works great as well, but I don't have any first hand experience with it. One thing to keep in mind is that for some dongles the Mac will not automatically switch over and use the USB dongle as the primary HCI controller. If that is the case then you will need to manually switch it over. Is a guide on how to do that.
Unfortunately Apple has just recently removed the Xcode Hardware IO tools download from their website, but if you end up needing it then I can send you a copy of it. Also, since bluetooth pairings are stored on the bluetooth controller itself it means that you will need to re-pair current bluetooth devices that you might have, such as a wireless mouse or keyboard. It can be handy to have a USB mouse at hand since the wireless one will stop working as soon as you switch the controller:P /A.