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 Ktrak – From Bike into a Snow Toy Sony's 1000000/1 Contrast OLED TVs Kit Turns Anything Into a Flying Drone Measure Everything with Laser Precision from Smartphone 150 Hours of battery life (MP3 Player) Watch YouTube Videos On TV Without A PC