Ultrahuman Ring Air Size 13 Aster Black

The Ring Air Size 13 Aster Black tracks sleep, heart rate, movement, and skin temperature for discreet wellness monitoring.

Designed for everyday wear, this Ultrahuman fitness tracker fits snugly on the finger and is comfortable overnight, making it suitable for users who prefer passive health tracking without a display or app alerts. Its fixed size 13 ring cannot be adjusted, so choosing the right fit is important for reliable sensor contact.

The ring pairs with iPhones running iOS 15 or later and Android devices running Android 6 or later via Bluetooth v5.0. Its battery lasts 4 to 6 days on a full charge, and it is water resistant up to 100 meters for up to 12 hours, allowing for showering and sleep tracking without removal. The outer shell is made from fighter jet grade titanium reinforced with tungsten carbide carbon coating, while the inner surface uses medical-grade hypoallergenic epoxy resin.

Model 170110 in black comes with a 1 year manufacturer's warranty.