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This is the MYO, a new motion controller mouse, but this one is special.
MYO has a sensor to detect the electrical impulses in the muscles of your forearm. This, alongside a motion detector, allows the armband to resolve your hand and arm movements with extreme precision, down to the individual fingers. It may even seem at times that your finger twitch is detected even before you’ve actually done so: this is because the muscles are activated slightly before your fingers actually start moving, and the MYO picks the signal up first.

More here
http://gadgetzz.com/2013/03/07/this-mouse-reads-electrical-impulses-in-your-arm/