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 5 Cool Kitchen Gadgets Everyone Needs New LCD Retains Image when Off Difference between £70,000 and £4,000 watch. Weird Bike For 7 People Keyboard – Elite of Geeks CD Lamp