Health monitoring: The smart ring provides comprehensive health monitoring, including heart rate and blood oxygen levels. This allows you to track your fitness and well-being conveniently and continuously throughout the day and night. Stay informed about your body's performance and make proactive decisions to improve your overall health. Extended battery life: Enjoy an extended battery life with the smart ring. A single charge provides 3-4 days of use, and the charging case extends this to up to 7 full charges. With a standby time of 30 days, you can trust that the ring is ready when you need it. The convenience of the charging case ensures you can easily charge on the go. Smart gesture control: The smart ring has built-in gesture control. Just wear the ring and double-tap your finger to switch videos or take photos. This intuitive control enhances your user experience, making it easier to manage your devices and media. The smart gesture feature adds a layer of convenience to your daily activities. Specifications: Size: No. 14 inner diameter 2.3cm, circumference 7.25cm No. 13 inner diameter 2.23cm, circumference 7 cm No. 12 inner diameter 2.15 cm, circumference 6.75 cm No. 11 inner diameter 2.07 cm, circumference 6.49 cm No. 10 inner diameter 1.99 cm, circumference 6.24 cm No. 9 inner diameter 1.9 cm, circumference 5.96 cm No. 8 inner diameter 1.82 cm, circumference 7.71 cm Material: Stainless steel Package includes: Ring*1 Charging case*1 User manual*1 Charger*1