Asus BT400, IOGEAR GBU521, GMYLE 3340).Ī far easier - albeit more expensive option - is to install an aftermarket Wi-Fi + Bluetooth 'upgrade kit' from either OS X WiFi or MacVidCards, which will add 802.11 a/b/g/n/ac and enable Bluetooth 4.0 LE.
If you're running Yosemite and want to take advantage of Continuity, you'd then just need to buy a third-party Bluetooth 4.0 USB dongle that utilizes the Broadcom BCM20702 chipset (e.g. You can easily DIY by finding suitable parts on eBay or Amazon and following instructions on forum sites such as MacRumors and elsewhere. The Apple Broadcom BCM94331CD adapter will add 802.11 a/b/g/n with Bluetooth 4.0 to an older Mac Pro, while the Apple Broadcom BCM94360CD adapter will enable 802.11 a/b/g/n/ac support (the primary difference between the two adapters being 802.11 ac).