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Yosemite's 'Handoff' will work only on Macs less than 2-3 years old

Gregg Keizer | June 23, 2014
Apple engineer confirms Handoff uses Bluetooth LE to pair devices; supported Macs may be in the minority

Apple's "Handoff" — one of the key new features of iOS 8 and OS X Yosemite — will work only on newer Macs that support Bluetooth 4.0 and the Bluetooth LE (low energy) technology, according to an Apple engineering manager.

While Apple didn't mention Handoff requirements when it unveiled the feature at its Worldwide Developers Conference (WWDC) earlier this month, a developer-only session there made it clear that Bluetooth LE is necessary.

"This is entirely about the proximity of your devices to your other devices," said Michael Jurewitz, lead engineering project manager for Continuity, during a June 4 developer session at WWDC that Apple has made public as an audio recording.

"We use BTLE [Bluetooth low energy] to actually let devices around you know what they should show in that lower left corner [of the screen, where Handoff notifications appear]," Jurewitz continued. "Which devices that actually show your apps is linked to the devices that you are signed into with the same iCloud account. We know you're signed into this device and we actually use the cloud to BTLE-pair your different devices to each other."

After the pairing, small amounts of data are passed between the devices, presumably also via Bluetooth, although Jurewitz wasn't specific.

Handoff, part of "Continuity," a term Apple's used to describe several features of iOS and OS X, allows users to begin an activity — writing an email, browsing the Web, creating a document — and then resume it on another device.

Many analysts identified Continuity in general, Handoff in particular, as one of the most important and interesting enhancements to iOS 8 and Yosemite, the two operating system upgrades slated to ship this fall.

But not all Mac, iPad or iPhone owners will be able to use Handoff, according to Jurewitz's comments.

Because Bluetooth LE was merged with the Bluetooth 4.0 specification in 2010, devices that support the latter spec are LE-ready. Apple has supported Bluetooth 4.0 and Bluetooth LE on the iPhone since 2011's iPhone 4S. Perhaps not coincidentally, that also the oldest iPhone which will run iOS 8, which also includes Handoff capabilities.

On Macs, however, it's a slightly different story. For example, the MacBook Pro notebook line didn't get Bluetooth 4.0 until the mid-2012 models, and the iMac not until late 2012. The MacBook Air, a lighter, thinner laptop, and the sans-screen Mac Mini have had Bluetooth 4.0 since mid-2011.

iPads have supported Bluetooth 4.0 since the March 2012 refresh — Apple's first Retina-equipped tablet — so 2011's iPad 2 and 2010's original iPad will not work with Handoff.

Mac owners can determine the age of their machine as Apple tracks it by selecting "About This Mac" from the Apple menu at the far left of the menu bar, then choosing "More Info..." from the ensuing window. The Mac's age will appear under the name of the model, as something like "Retina, 13-inch, Late 2012" for a MacBook Pro laptop put into service in early 2013.


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