In a world full of very competent health and lifestyle trackers, meet the most advanced of them all. The Jawbone UP3 sports skin and ambient temperature sensors and is so smart it can even check your hydration levels. Not only does it know when you’re playing sport, it will know which one, is water resistant to 100 feet and can even tell when you’re in the REM level of sleep. Crazy to think so much tech can be crammed into something so thin and flexible.
