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But no matter how much you spend on a Surface Pro 4, when you open the box and set it up, there will be one important missing ingredient. The Type Cover, a slim keyboard and screen protector in one, is still sold separately, no matter which Surface Pro 4 configuration you buy. From the earliest days of the Surface, that keyboard cover has rightly been called out as an impressive engineering feat, and the latest version even improves on that. It now features widely spaced island-style keys (like those found on practically every laptop), and a larger touchpad with a better touch surface. Like the previous Type Covers, it connects via a magnetic hinge along the bottom of the tablet, and folds shut over the cover for easy transport. Also like previous Type Covers, it costs an extra $129, £109 or AU$199. We rarely see a Surface in Microsoft's advertising materials or press previews without the keyboard cover attached, but for some reason, the company still won't pack the most noteworthy part of the Surface ecosystem into the box. For such a premium product, it's an omission that continues to mystify.