Ultrahuman Ring AIRThe World’s Most Comfortable and Compact Smart Ring that monitors your sleep, movement, and recovery Rugged MaterialsFighter jet grade titanium with carbide carbon coating for additional scratch resistance. Hypoallergenic inner shell. 24/7 wearability Features PackedA 6-axis motion sensor captures the intricacies of your body's movement, A non-contact temperature sensor effortlessly monitors your body's temperature Notch-less and fully roundMore seamless compared to other existing smart rings on the market Incredibly LightWorld's Lightest Smart Ring, weighing in as light as 2.4 g, 11x lighter than a smart watch Robust Battery6 days so you can explore the uncharted, uninterrupted. Wireless charger included Adventure ReadyIP58 rated, with water resistance up to 330 feet. Be at home on water and land.