The Ultrahuman Ring AIR Smart Ring in size 10 is a sleek and advanced activity tracker designed for both indoor and outdoor use. Made of raw titanium, this ring provides accurate measurements for heart rate, calories, and distance, thanks to its infrared and optical bio-tracking sensors. With a battery life of up to 6 days and compatibility with both iOS and Android operating systems, this ring is perfect for those looking to track their fitness progress with precision and style. The unisex design and lightweight construction make it a versatile and comfortable option for anyone looking to improve their health and wellness.