1. Comprehensive health monitoring fitness tracker ring not only monitors heart rate, blood oxygen saturation, but also records steps, distance, calorie consumption, and has multiple sports modes. 2. Ultra-long battery life The 18mAh battery combined with an efficient battery management system allows this smart ring health tracker to work for up to seven days, but it only takes two hours to fully charge 3. Choose the size before purchase Choose the most suitable size from a range of sizes between ring size 7 and 12 to ensure all-day comfort. The sleep smart ring is only the size of a coin and lightweight. It can be worn during the day and at night, and you can hardly feel it 4.5ATM waterproof and remote photo control Don't worry when it rains or swims, the waterproof smart ring has a 5ATM waterproof rating. After enabling the remote photo function on the App, just shake the finger wearing the ring to take a photo remotely. 5. Accessories and packaging, smart ring*1, charging cable*1, instruction manual*1. 。