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The sensors could be coupled with Bluetooth to control a gadget, such as a mobile phone, in a pocket. It could be used to control a music player strapped to the upper arm. Finally, he said, the sensors could work with a pico-projector that uses the forearm or hand as a display surface. This could show buttons, a hierarchical menu, a number pad or a small screen. Skinput can even be used to play games such as Tetris by tapping on fingers to rotate blocks. Mr Harrison would not be drawn on how long it might take Skinput to get from the lab to a commercial product. "But," he said, "in the future your hand could be your iPhone and your handset could be watch-sized on your wrist."