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Amazon.com: Mac Book Air Charger, AC 45W Magnetic T-Tip Power Adapter Charger Compatible with MacBook Air 11-inch/13-inch (2012-2017) : Electronics
MacBook Air (11-inch, Mid 2012) - Technical Specifications
Amazon.com: 45W Mini Charger for MacBook Air 11 inch 13 inch Magnetic 2 MAC Power Charger Adapter - Lightweight & Portable - One Extra USB Port Design 1 : Electronics
Which MacBook charger do I need: Buying advice | Macworld