This smart brush tells you if your hair is healthy The Kérastase Hair Coach is a hairbrush that connects to an app on your phone. Facebook Prev Article Next Article Gadgets Checkout these cool gadgets... Related Posts Onean Electric Jet Board Lets You Surf Without Waves Arial ‘ShadowHawk’ Police Drones Can Now Deploy Tasers & Tear Gas The Volcopter Has Now Taken Flight! FireFly Game On Microsoft Surface This Russian Motorcycle Can Do Anything Fruit-Powered Clock