The Keen bracelet looks like a fitness tracker and uses motion sensors to detect its wearer’s specific behavior after a one-time training with a companion mobile app. When the device senses your hand doing your unwanted gesture, it vibrates to make you aware of what you are doing, giving you an opportunity to stop.

"The first step is being aware and bringing it to your attention... [Keen2] really is a brilliant idea."
–Howie Mandel on the Marcus Lemonis podcast