Keen is a smart bracelet designed to help you become aware of subconscious behaviors that are physical, repetitive movements or gestures of the hands, focused on the body.  These behaviors are often called Body Focused Repetitive Behaviors, or BFRBs.  They include, but are not limited to: hair pulling (trichotillomania), nail biting (onychophagia), skin picking (dermatillomania / excoriation disorder), and thumb sucking.

Keen is trained with a companion mobile app one time by performing your specific gesture for 20 seconds.  Nail biters would train Keen by actually biting their nails. Hair pullers who play with a patch of hair before pulling would train Keen by playing with their hair.  Keen's sophisticated motion sensors record the "fingerprint" of your repetitive behavior, and thereafter silently monitor your hand.  When Keen senses your gesture, it makes you aware with a gentle vibration.