Review on StarTech.com Bluetooth Adapter - Mini Bluetooth 4.0 USB Adapter - Long Range 50m/165ft Wireless Dongle - Smart Ready LE+EDR (USBBT1EDR4), Black by Brad Bryant

For those of you wondering about MacBook compatibility, I have a late 2013 13" MBP running v10.14. For reasons I won't go into detail, I need an external bluetooth dongle. I chose this one and it really was PnP. Plugged it in while the MBP was on (you do NOT need the included drive) then I checked the system report to make sure the mac address was indeed changed to that dongle. I then turned on Bluetooth with the icon at the top of the screen, connected to the trackpad, and all is well. Also connected to my iPhone 6s and iPad mini 4. Works the same as the internal BT xmtr, range is somewhere over 25ft (didn't have enough room for further testing). The key extends 3/8" beyond the edge of the MBP.