Oura Ring Gen3 Horizon - Black - Size 8 - Smart Ring - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery Life - THE REVOLUTIONARY SMART RING - Track your sleep, activity, stress, heart rate and more with the Oura Membership. - MORE ACCURATE BY DESIGN - Your finger provides the most accurate pulse reading, making your health data and insights more personal than ever. Oura Ring’s research grade sensors monitor over 20 biometrics with precision. - SYNC WITH YOUR APPS - Compatible with iOS and Android — Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more. - EASY TO WEAR, EVERYWHERE - Every Oura Ring Gen3 is made of titanium: built to last, lighter than the average wedding band, non-allergenic, and water resistant. From a workout to a night out, Oura discreetly monitors your health with comfort and accuracy. - LOOKING FOR THE BEST HEALTH TRACKER? - Whether you’re searching for a sleep ring or fitness ring, Oura Ring Gen3 is for you— this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress - in style.