Notch is a wearable sensor application with a twist, it allows users to use multiple notch sensors to create a more complete image of their movements. It can be turned on and off, as well as set to a continuous collection phase. Not only does it capture movement information, but it also provides haptic feedback through a small vibration on the sensor. The product is still in its Kickstarter phase in an already crowded mobile tracking market, so time will tell if it makes it off the ground.
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