Surface has a 3-millimeter-thick detachable cover that doubles as a keyboard and connects to the main body of the tablet via a magnetic hinge. iPads have similarly attached covers, but that's all they are -- covers. They're not keyboards. The Surface Touch Cover keyboard has no mechanical keys, but the areas marked as keys are touch sensitive, and Microsoft claims they respond more quickly to taps than a traditional keyboard. A second version of the keyboard called Type Cover does have mechanical keys and is 5 mm thick. Microsoft claims that it, too, responds faster to touches. The covers come in orange, aqua, pink and black.