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Microsoft Surface may be billed as a tablet, but hiding in its 3mm cover is a pressure-sensitive keyboard called Type Cover which will allow the tablet to transform resemble more of a computer on the go without the burden of a bulky keyboard case.
Type Cover latches onto the Surface tablet with magnets (much like the Apple's Smart Cover does with the iPad), and "senses keystrokes as gestures," and has a touchpad area for cursor manipulation, according to Microsoft. Type Cover also has a built-in accelerometer, so that it knows when it is folded back behind the tablet (thus preventing accidental input). Microsoft says that Type Cover can detect the force you're placing on it down to the gram, and won't input characters when you just have your fingers resting on the keys.