Pure invention. We designed the new MacBook to be not only thinner and lighter, but more functional and intuitive than ever before. To do that, we couldn't just shave a millimeter here, a gram there. So we started from scratch, reinventing each essential element as part of a singular, deceptively simple design. It's everything there is to love about Mac. In its purest form ever. A keyboard reimagined from A to Z. From the beginning, our goal was to design a full, uncompromising Mac experience. And a full-size keyboard is an essential part of that. In order to fit a full-size keyboard in the incredibly thin MacBook, we designed the keyboard from the ground up. Each component has been rethought specifically for the new MacBook, from the underlying mechanism to the curvature of the surface of each key to the distinctive new typeface. The result is a keyboard dramatically thinner than its predecessor. Now when your finger strikes the key, it goes down and bounces back with a crisp, consistent motion that makes typing with precision a breeze. Butterfly mechanism. Traditional keyboards use a scissor mechanism, which tends to wobble around the edges. This creates a lack of precision when you strike anywhere except the center of the key. We needed to reduce key wobbling for a keyboard this thin; otherwise, striking a key off-center could result in the keycap hitting bottom before a keystroke registers. So we designed an entirely new butterfly mechanism.
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<br />12.0-inch TFT LED-backlit Active-Matrix Retina Display with IPS Technology, 2304 x 1440 pixel resolution (~226ppi pixel density)
<br />Intel Core M 1.1 GHz, Mac OX X 10.10 Yosemite, Intel HD Graphic 5300
<br />Internal Memory: 256GB or 512GB, 8GB RAM
<br />Wireless LAN 802.11a/b/g/n/ac; Bluetooth: v4.0; Ports: USB v3.1 x1 (Gen 2 Type-C), Display Port x1, Audio Port x1
<br />78-Key Full Size Keyboard, Multi-touch Gestures, Force Touch Trackpad
<br />Built-in 39.7 watt-hour lithium-polymer battery - Up to 9 hours of wireless wed usage
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<br />Package Contents: t
<br />Macbook, Extension Cable for Power Brick, Power Brick with Magnetic Cord
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<br />Grade A = A+ Quality, Factory Refurbished, 30-Day Money-Back Guarantee, 100% Functional. This device has been professionally restored to working order by a manufacturer or manufacturer-approved vendor. This means the product has been inspected, cleaned, and repaired to meet manufacturer specifications and is in A+ Top Quality cosmetic condition. It is in 100% working order with no functional problems. 
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<br />Grade B = This device is in Fair cosmetic condition and may have scratches and scuffs. It is in 100% working condition with no functional problems. It has been cleaned, tested and passed an in-depth physical and automated inspection at our service center. Our devices must pass this rigorous quality check before they are allowed for sale .