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 This light-up bike helmet has built-in turn signals Water Powered Battery Change your cell into a remote control Spider Catcher – Finally a Tool For Those Who Fear Spiders RC Car with Camera Meets a Group of Lions Wiimote Controlled Vacuum