Features 1、Premium Material: Made with stainless steel and zirconia ceramic, the smart health ring is not only durable but also aesthetically pleasing with an elegant design. 2、Lightweight and Comfortable: With its lightweight design, the ring offers a barely noticeable wearing experience, ensuring comfort throughout the day. 3、Multiple Functions: The smart ring is equipped with various functions, allowing you to monitor sleep, body temperature, step count, and other health related data. 4、Fitness Tracker: In addition to health monitoring, this ring serves as a fitness tracker, accurately recording your daily step count, enabling you to track and improve your exercise routines. 5、Thoughtful Gift: This ring makes for a meaningful gift, suitable for any occasion or holiday, such as birthdays, anniversaries, Thanksgiving, Christmas, or Valentine's Day. Item Type: Smart Ring Material: Stainless Steel, Zirconia Ceramic, Electronic Components Ring Battery Type: Lithium Battery (Built in Battery) Ring Battery Capacity: 18mAh Ring Battery Life: Approximately 3 to 5 days Ring Charging Time: 45 minutes Applicable size: Ring Number:Number 17, Applicable Finger Circumference:56mm / 2.2in, American Size:Number 7 Ring Number:Number 18, Applicable Finger Circumference:60mm / 2.36in, American Size:Number 8 Ring Number:Number 19, Applicable Finger Circumference:64mm / 2.52in, American Size:Number 9 Ring Number:Number 20, Applicable Finger Circumference:69mm / 2.72in, American Size:Number 10 Ring Number:Number 21, Applicable Finger Circumference:73mm / 2.87in, American Size:Number 11 Ring Number:Number 22, Applicable Finger Circumference:75mm / 2.95in, American Size:Number 12 Package List 1 x Ring 1 x Charging Cable 1 x Instruction Manual