**SIZE FIRST** Ultrahuman Ring sizes are different from standard ring sizes. Purchase Ultrahuman Sizing Kit first to get the perfect Ring AIR size. Ring AIR is available in 10 sizes from 5-14. **NO SUBSCRIPTION REQUIRED** Download the Ultrahuman app and get all of the available insights with no subscription. **THE RING OF YOUR DREAMS** Ultrahuman Ring AIR is the perfect sleep tracker ring. Along with insights on all your sleep stages — REM, Deep Sleep, Light Sleep and Wakefulness, get actionable steps to improve sleep so you're ready for the day. **DESIGNED TO KEEP YOU MOVING** The 'Movement Index' is designed to keep you moving all day for optimum glucose metabolism, and to increase your non-exercise energy usage through the day. With this all-in-one activity and fitness tracker, you can track steps, workouts and calories for insights into your all-day activity. All features work together seamlessly, to make sure you get the most out of the smart ring. Workout Tracking is now easy, with a dedicated Workout Mode that tracks Heart Rate during workouts — you can get insights into your cardiovascular response, track intensity levels, and make informed decisions to improve your fitness outcomes. **ENHANCED RECOVERY** Ring AIR is geared to help you recover better, with focused recovery tracking. The 'Dynamic Recovery Score' is derived from a blend of key metrics including heart rate monitoring, Heart Rate Variability (HRV) and skin temperature that track not only sleep but also every aspect of your lifestyle, giving you actionable insights. Designed to evolve with you, Dynamic Recovery will update in real-time when you take naps, sauna sessions or any contributors to enhance your recovery. **FUNCTIONALLY AESTHETIC** The Ultrahuman Ring AIR is forged with space grade titanium. Meticulously designed for enhanced comfort, this sleek device combines minimal form factor with precise performance, enabling users to effortlessly monitor key health metrics. 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) - Create better habits with reminders to get some Vitamin D, optimise your caffeine intake, or cut down on screentime - 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 and symptom patterns - The outer shell is made from tough titanium with a carbon coating to resist everyday wear and tear - It charges in just 90 minutes, and you get up to 6 days of battery life Bluetooth, 24 mAh, Size 13, Space Silver Ultrahuman Ring Air- Size-13- Air Silver. Device type: Smart ring activity tracker, Form factor: Round, Product colour: Silver. Battery life: 6 day(s), Battery technology: Lithium Polymer (LiPo), Battery capacity: 24 mAh. Width: 81 mm, Depth: 81 mm. Mobile operating systems supported: Android 8.0, Android 10.0, Android 9.0, Android 11.0, Android 12.0, Android 13.0, iOS 15, iOS 16,.... Cables included: USB Type-C to USB Type-C Mighty Light. Amazingly Sleek. 2.4 gms light. 11x lighter than a typical smartwatch. 2.4 mm sleek. Discreet design for everyday use. World’s most comfortable wearable Glides with you through your day, feeling lighter than air. It’s there when you need it, and invisible when you don’t. Form factor so discreet, it’s easy to forget you’re wearing it but hard to ignore its capabilities. Wake up to your sleep insights The Sleep Index, intelligently designed to be your sole metric for sleep health, assesses your total sleep duration, resting heart rate, and restfulness, creating a comprehensive picture of your sleep quality. Temperature tracking made easy Skin temperature is vital for measuring your body's physiological states and responses to various factors, including exercise, stress, and illness. Listen to your body clock The Phase Response Curve (PRC) describes the intricate interplay between a stimulus, such as light exposure, food or exercise mapped to a shift in your body's circadian rhythm. Here’s to a more active you The Movement Index is designed to keep you moving for optimum glucose metabolism and to increase your non-exercise energy usage. Maximize recovery with key HRV insights The correlation between HRV and recovery is pivotal to understanding the body's recuperative capabilities and its readiness to take on another day. The only nudges that you need Personalised nudges for a healthier you. Get tailor-made insights and alerts to help you make better choices in real time. Performance Touchscreen No Display type No Design LED indicators Yes Control type Wireless Housing material Resin Product colour Silver Form factor Round Device type Smart ring activity tracker Features Motion sensor Yes Quality of sleep Yes Hours slept Yes Pedometer Yes Active minutes Yes Heart rate monitor Yes Ports & interfaces Bluetooth Low Energy (BLE) Yes Bluetooth Yes Power Charging source Wireless Charging time 3 h Rechargeable battery Yes Battery capacity 24 mAh Battery technology Lithium Polymer (LiPo) Battery life 6 day(s) Weight & dimensions Depth 81 mm Width 81 mm System requirements Mobile operating systems supported Android 8.0, Android 10.0, Android 9.0, Android 11.0, Android 12.0, Android 13.0, iOS 15, iOS 16, Android 6.0, Android 7.0 Packaging content USB charger included Yes Cables included USB Type-C to USB Type-C