Adafruit Bluetooth 4.0 USB Module (v2.1 Back-Compatible) [ADA1327]

Add Bluetooth capability to your computer super fast with a USB BT 4.0 adapter. This adapter is backwards compatible with v 2.1 and earlier, but also supports the latest v 4.0 /Bluetooth Low Energy. Inside lies a CSR8510 Bluetooth USB host. We've used this with great success on a Windows 7 computer, installing as a 'generic' Bluetooth device, but we expect it to work just fine with any modern computer as this chipset is very common. So far we've tested it to communicate with Bluetooth data modules only.
Revision note: As of Friday, August 28th, 2015 these now have unique MAC addresses! That's great because now you don't have to worry about using two or more of them at once, handy for people turning these into beacons.