Yosemite's new Handoff and Continuity features are pretty amazing. This includes making phone calls, picking up where you left off in apps on other Apple devices seamlessly. Unfortunately even the latest USB Bluetooth 4.0 dongles aren't working at all with this feature. Fortunately there are solutions available that make these features work 100%.
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The best way to get Handoff and Continuity features...
Continuity and Handoff Capable Apple Mini Cards + PCIe and mini-PCIe Adapters
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Continuity and Handoff Capable Apple Mini Cards + PCIe and mini-PCIe Adapters