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.
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.

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Some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. To ensure you receive a genuine Apple battery during a battery replacement, we recommend visiting an Apple Store or Apple Authorized Service Provider. If you need a replacement adapter to charge your Apple device, we recommend getting an Apple power adapter.
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