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Still, to buy AppleCare+ after the fact you generally have to run a diagnostic test on the device in question, so Apple knows it’s in good working order. And no matter when you buy your AppleCare+ plan, the coverage starts from the day you bought your device. So you don’t get an “extra” two months of coverage if you wait two months to buy the plan.
The 2010 models include two speakers for stereo sound while earlier versions have one speaker located under the keyboard. The 2011 model replaces DisplayPort with a Thunderbolt 1 port, and also has a 1280×720 FaceTime HD Camera, replacing the previous 640×480 iSight camera. The 2012 model replaces USB 2 with USB 3, and uses the MagSafe 2 instead of the MagSafe connector for charging. The 2015 model updated the Thunderbolt port to Thunderbolt 2.