Mac Book Air is designed to be powerful, capable, durable, & enjoyable to use. With enough battery life to get you through the day. That's the difference between a notebook that's simply thin & light & one that's so much more. Multi-Touch technology is part of practically every Apple product. It's the best & most personal way to interact with your devices. & the optimal way to experience Multi-Touch on a notebook is through a trackpad. That's precisely the case with Mac Book Air. The trackpad's spacious, all-glass surface doesn't have a button because the whole thing is the button. & with multi-touch gestures in OS X, you can interact with Mac Book Air in ways that feel more intuitive & realistic than ever before. Mac Book Air features a unibody design for both the main enclosure & the display. Unibody construction means a higher-precision, less complex design with fewer parts. That translates to a notebook that's exceptionally thin & light, yet durable enough to handle the rigors of everyday use. In addition, Mac Book Air offers innovations you won't find anywhere else.