Ultrahuman Ring Air Size 11 Aster Black

The Ring Air Size 11 Aster Black tracks sleep, heart rate, steps, and skin temperature for all-day wellness monitoring.Sized for a fixed size 11 finger, this Ultrahuman smart ring is crafted from fighter jet grade titanium with a Tungsten Carbide Carbon coating and hypoallergenic epoxy resin interior. It pairs with iPhones running iOS 15 or later and Android devices running Android 6 or later, connecting via Bluetooth v5.0. The ring is comfortable for overnight wear and is water resistant up to 100 meters for up to 12 hours, making it suitable for swimming and daily routines.Infrared photoplethysmography and a 6-axis motion sensor enable circadian rhythm tracking, temperature-based ovulation prediction, caffeine window detection, AFib detection, and sleep analysis. The battery lasts 4 to 6 days on a full charge, supporting continuous health tracking without frequent recharging.Model 170108 in black comes with a 1 year manufacturer's warranty.