BOYACARE - Smart Ring Health Tracker with Sleep Heart Rate Stress Fitness Blood Oxygen Vibration Alerts / No Subscription - Silver - (2026)

Since the size of a Lynx smart ring differs from standard jewelry ring sizes, please purchase a sizing kit to find your perfect size and then purchase the Lynx health smart ring. The sizing kit includes 8 ring sizers (sizes 6-13) and a quick-start guide for this measuing tool to help measure your ring size more accurately.

Track your health, sleep, fitness, and daily wellness in a sleek, lightweight design with the BOYACARE Smart Ring. Built for all-day and all-night wear, this smart ring helps you monitor key health metrics while staying comfortable, discreet, and easy to use. BOYACARE tracks heart rate, blood oxygen, HRV, skin temperature, sleep, stress, activity, and more, giving you a clearer picture of your body throughout the day. Automatic sleep tracking helps you understand sleep duration, sleep stages, and nighttime trends, while fitness and activity monitoring help you stay aware of movement, exercise, and recovery.

The Oura Ring 5 Sizing Kit allows for you and those around you to find the ideal fit before purchasing. With an Oura Ring 5 Sizing Kit purchase, you will receive a $10 Best Buy gift card to use towards your Oura Ring 5 purchase. A properly fitting Oura Ring 5 will result in the highest possible data accuracy, comfort, and overall experience. Oura Ring 5 sizes are slightly different from standard ring sizes and other Oura Ring generations. It’s important to size yourself and follow sizing instructions. Oura Ring 5 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing on your index, middle, or ring finger.