Will My Mac Support Handoff In OS X Yosemite?
In order for your Mac to use Handoff in OS X Yosemite, your Mac needs to have at least Bluetooth 4.0. To find out if yours does, launch the Terminal app on your Mac (it's inside Applications > Utilities) and then paste in the following command:
system_profiler SPBluetoothDataType | grep LMP
Hit enter and look for something called "LMP Version" in the results. You want to see a version of 0x6 or higher. If you do, then your Mac has Bluetooth 4.0 and will support Handoff in Yosemite.