Ultrahuman Ring Air Size 12 Aster Black

The Ring Air Size 12 Aster Black tracks heart rate, sleep, steps, and skin temperature for users seeking a lightweight, unobtrusive fitness tracker. This Ultrahuman fitness tracker fits those who want to monitor their health and recovery without the bulk of a smartwatch. Its size 12 ring is designed for a snug fit, ensuring accurate sensor readings during daily activities and sleep. The ring connects to iPhones running iOS 15 or later and Android devices running Android 6 or later via Bluetooth v5.0, allowing you to view insights in the Ultrahuman app. Its battery lasts 4 to 6 days on a full charge, reducing the need for frequent recharging. The water resistance rating of up to 100 meters for 12 hours means you can wear it during swimming or intense workouts. Model 170109 in black comes with a 1 year manufacturer's warranty.