1、Multi Functional: The smart ring offers multiple functions, including real time monitoring of heart rate, body temperature, and blood oxygen levels. It helps you keep track of your health and wellbeing all the time. 2、Sleep Quality Detector: This bluetooth connection smart ring can detect your sleep time, patterns, and quality, helping you improve your sleep quality. 3、Fitness Tracker: The smart health ring can also be a fitness tracker as it records the number of steps you take in a day and provides an excellent user experience. 4、Aluminum Alloy and Ceramic Material: The smart ring is crafted from premium aluminum alloy and ceramic, making it durable, waterproof, and aesthetically pleasing. 5、Lightweight Design: The ultra light body of the health tracker smart ring is almost unnoticeable. It's so lightweight that you might forget you have it on. 6、Ideal Gift: This little smart ring makes a meaningful gift suitable for any occasion or festival, including birthdays, anniversaries, Thanksgiving, Christmas, Easter, and Valentine's Day. Item Type: Health Tracker Smart Ring Material: Aluminum alloy, ceramic, electronic components Battery Type: Lithium battery (shipped with built in battery) Battery Quantity: 18mAh Duration: 3 to 5 days Charging Time: 45 minutes Protection Grade: IPX8 Applicable size: Ring Number:No. 17, Finger Circumference:56mm/2.2in, International/US:7, Inside Diameter:17mm/0.67in Ring Number:No. 18, Finger Circumference:60mm/2.4in, International/US:8, Inside Diameter:18mm/0.71in Ring Number:No. 19, Finger Circumference:64mm/2.5in, International/US:9, Inside Diameter:19mm/0.75in Ring Number:No. 20, Finger Circumference:69mm/2.7in, International/US:10, Inside Diameter:20mm/0.79in Ring Number:No. 21, Finger Circumference:73mm/2.9in, International/US:11, Inside Diameter:21mm/0.83in Ring Number:No. 22, Finger Circumference:75mm/3.0in, International/US:12, Inside Diameter:22mm/0.87in 1 x Health Tracker Smart Ring 1 x Charging Cable 1 x Specification