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The BBC has revealed the final design of the Micro Bit, a pocket-sized computer set to be given to about one million UK-based children in October. The device - which features a programmable array of red LED lights - includes two buttons and a built-in motion sensor that were not included in a prototype shown off in March. But another change means the product no longer has a slot for a thin battery. That may compromise its appeal as a wearable device. An add-on power pack, fitted with AA batteries, will be needed to use it as a standalone product.