1、MULTIPLE FUNCTIONS: The smart ring has multiple functions that can monitor your body temperature and all sports health data at any time allowing you to keep an eye on your health. It can also be a sports ring to record your pace throughout the day. 2、DETECT SLEEP QUALITY: This sleep monitoring ring can detect your sleep time and sleep status, tell you how your sleep quality is. Note that the Bluetooth distance is about 10 meters, please do not be too far away from your phone's Bluetooth. 3、LIGHTWEIGHT DESIGN: The waterproof smart ring's ultra lightweight body design allows you to comfortably wear it all day long without feeling burdened. The wearing experience is so light that you may forget it's there. 4、SMART RING MATERIAL: The smart ring is made of aluminum alloy and ceramic, durable and beautiful, features a modern and stylish design. With a charging case, it can be charged anywhere and is easy to carry. 5、IDEAL GIFT: This small ring is a meaningful gift choice for your husband and love one. Suitable for any scene or festival, such as birthday, anniversary, Thanksgiving, Christmas, Easter or Valentine's Day. Item Type: Smart Ring Material: Aluminum Alloy, Ceramic, Electronic Components, ABS Ring Battery Type: Lithium Battery (Shipped with Built in Battery) Ring Battery Capacity: 18mAh Ring Battery Life: Approx. 3-5 days Charging Case Battery Type: Lithium Battery (Shipped with Built in Battery) Charging Case Battery Capacity: 300mAh Ring Size: Size 20 Fits Finger Circumference: Approx. 69mm / 2.7in Inner Diameter: Approx. 20mm / 0.8in 1 x Smart Ring 1 x Charging Case 1 x Charging Cable 1 x User Manual