Feature: 1. Testing Sleep Quality: This smart ring can detect your sleep time and sleep status, telling you how good your sleep quality is. Attention, the Bluetooth distance is about ten meters, please do not be too far from the Bluetooth of your phone. 2. Multiple Functions: The smart ring has multiple functions that can monitor your sleep, body temperature, and all exercise health data at any time, allowing you to observe your physical condition at any time. 3. Lightweight Design: The ultra lightweight body of the smart ring has no sense of wearing, and the wearing experience is so light that you may forget its existence. 4. Sports Ring: Smart health ring can also be a sports ring, as it can record your steps throughout the day and provide you with a good user experience. 5. Smart Ring Material: The smart ring is made of aluminum alloy and ceramic, which is durable, and has exquisite workmanship and beautiful appearance. 6. Ideal Gift: This small ring is a meaningful gift. It is suitable for any scene or holiday, such as birthdays, anniversaries, Thanksgiving, Christmas, Easter, or Valentine's Day. Specification: Item Type: Smart Ring Material: Aluminium Alloy, Ceramic, Electronic Components Battery Type: Lithium Battery (shipped with built in battery) Battery Capacity: 18mAh Battery Life: Approx. 3-5 Days Charging Time: Approx. 45 minutes Protection Level: IPX8 . Package List: 1 x Smart Ring 1 x Charging Cable 1 x User Manual