Things my Ultrahuman Ring AIR does: TRACKS MY VITAMIN D INTAKE / SUN EXPOSURE. vitamin a is so important to our health. here you can add how long you were out in the sun and it tracks the uv of your location, now long you need to be outside to reach your goal and how long until you burn. plus you can add how mueh or how little of your skin was exposed for more accurate results. LTKWorkwear LTKActive LTKStyleTip