While Handoff is available on all iOS 8 and OS X Yosemite, its reliance on Bluetooth Low Energy (LE) makes it a limited feature that works only on new Macs. Here’s a handy compatibility list to check whether your Mac (Macbook, Mac mini, Mac Pro) supports Handoff. Handoff Compatibility List for Macbooks and iMac

MacBook Air mid-2011 modelMacBook Pro 2012 modeliMac 2012 modelMac mini 2011 model, 2014 modelMac Pro 2013 modeliMac with Retina display

*-currently doubtful about this, but here’s a long solution you might want to try to get Handoff on MBA 2011 and Mac mini 2011. Bluetooth Low Energy: Handoff requires that your devices are connected/paired over Bluetooth. And not just any version of it. Apple designed Handoff specifically to work over Bluetooth 4.0 (Low Energy). So, only those devices that support Bluetooth v4.0 will be able to handle Handoff. Interestingly, some users have said that using a Bluetooth 4.0 adapter made Handoff work on their incompatible Macs. But there are also users who have had no luck there. How to find the Bluetooth version of Mac Running OS X Yosemite:

If you’re running OS X Yosemite, checking if your Mac has Bluetooth LE is easy and straightforward:Click the Apple iconto open the menuClick on About this Mac

Now, click on System Report…

In the next window, under Hardware, click on Bluetooth

Check for Bluetooth Low Energy Supported: Yes in the right pane. If you see “Yes”, your Mac supports Bluetooth LE and Handoff will work right off the bat (after you enable it from System Preferences → General)

If you are running older versions of OS X, here’s how to find the Bluetooth version:

Click the Apple iconto open the menuNow, click on About This MacThen on More Info…Click on System Report…Click on Bluetooth under HardwareThen scroll down on the right pane till you find LMP VersionIf the LMP Version says ‘0x6’, your Mac supports Bluetooth LE and Handoff will work. If not, no luck How to Check if Your MacBook Supports Handoff   - 69How to Check if Your MacBook Supports Handoff   - 67How to Check if Your MacBook Supports Handoff   - 95