We all know proper hydration is a key component of good health. Yet none of our activity trackers let us keep track of it. Until now. The LVL Wearable Hydration Monitor uses red light technology that measures 10 times deeper into your body than the green lights commonly found in fitness trackers, letting it both measure hydration levels and grab hyper-accurate heart rate readings. It also tracks your activity, sleep, and mood, and thanks to a case created by frog design, it looks far better than you'd expect from a piece of medical-grade equipment.