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 Watch Shows "Time Remaining" not "Time" XTERRAIN500 – an Electric Bike with Monstrous Off-Road Fat Tires Tikker – The Watch That Has a Countdown to Your Death Air Swimming Fish – Cool Toy Solu is World’s Smallest General Purpose Computer with a Built-in Touchscreen Display World’s Smallest Production Quadcopter