The device was designed by Kei Nakatsuma, a PhD student at the University of Tokyo. Combining a series of infrared detectors and piezoelectric sensors, it can detect input on the back of your hand as well as sound input from your gestures. It's not without its limitations; it can handle pinch or rotate gestures just yet, and harsh sunlight makes it harder to see your fingers, but this promises to makes interacting remotely with your smartphone possible.
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