Shine activity tracker by Misfit Wearables. (Accelerometer and other as-yet-unknown sensors). All-metal, waterproof activity tracker that you can sync with your smartphone just by placing it on your phone screen. Proprietary sensor algorithms track cycling and swimming, in addition to steps. Replaceable battery. "To see how active you've been throughout the day, simply tap Shine and a halo of lights shines through invisible micro-holes, laser drilled into the metal casing."