The Ultrahuman Ring Air's ultra-light design feels so natural, you'll hardly notice you're wearing it. So, you can go about your day and sleep soundly at night, all while it does its thing. Your daily sleep score shows you how well you've rested. You can track your sleep stages, see what's getting in the way of your shuteye, and unlock personalised tools for a better night's rest. Dynamic Recovery keeps an eye on key indicators like sleep, stress, skin temperature, and HRV. So, you can make time for a power nap or breathwork exercise. Good to know - PowerPlug discreetly monitors your heart rhythm to detect early signs of Artial Fibrillation (AFib) - It uses advanced tracking sensors to give you clearer insight into your sleep, movement and heart health - Keep tabs on your everyday activity with VO2 Max, steps, distance, and calorie tracking - You can track your menstrual cycle and get insights into your fertility windows - Its medical%u2011grade materials keep it comfy while staying tough for everyday wear - You get 100 m water resistance, so it's fine for swims, showers and sweaty workouts - It charges in just 90 minutes, and you get up to 6 days of battery life