Introducing the Ultrahuman Ring Air, the ultra-comfortable fitness wearable. Its notch-free, ultra-thin design and smooth inner shell provide unparalleled comfort 24/7. With features such as sleep tracking, this sleek device allows for effortless monitoring of sleep, movement, heart rate, and more. Weighing only 2.4 grams, it is also the lightest smart ring on the market. By combining minimalism with precise performance, the Air Ring helps users better understand their sleep stages and overall wellbeing. In addition, its Workout Mode tracks various activities and provides deeper insights into training metrics. The Ultrahuman Ring AIR also offers a unique Stimulant Window feature for caffeine enthusiasts, as well as a long-lasting battery and waterproof design. 1 lithium metal battery, Type C to Type C cable, and wireless charging base included.