Specifically, "Waterproof Cooling Fan" is only 13.1mm thick slim lightweight MacBook, MacBook Air 11 inches than cash 24% thinner (old 17.3) and weighs less than 1kg, has been by far the lightest MacBook. Meanwhile, the new full-size keyboard with edge-to-edge design, the distance between each "Waterproof Cooling Fan" buttons have also been reduced, and the keys inside the butterfly also adopted a new structure, the surface area of each key to expand 17% ensure that the keyboard in a thin 40% of cases remains stable and accurate input, including "Waterproof Cooling Fan" to enhance the stability of 4 times. Of course, this keyboard is also equipped with a LED backlight.