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.
You, she reminds, are who’s really in control. And that’s where Keen comes in. When the bracelet vibrates, it’s bringing the picking compulsion from the subconscious into the conscious — giving you the ability to then consciously say to yourself “my hands are not where I want them to be”.
It's important that Keen fits snugly. Here's a quick guide to help you decide which bracelet size to order: