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 Gaming Controller Gives Tactile Grip Feedback E-volo’s 18-rotor Electric Volocopter First Test Flight Revisiting: Jetlev Flyer Water Powered Jet-Pack The Powerup Backpack That Can Charge Your Laptop Water-Powered Hoverboard Might be Coolest Yet, Combines Surfing with Skateboarding When Electric Skateboard Meets Snowboard