1. [Body before purchasing] Please measure your finger circumference, then calculate the inner diameter of your finger, find the corresponding ring size number. .2. [Sleep monitoring and sleep score] It is designed to help you understand the various stages of sleep such as deep sleep, fast eye movement sleep, light eye movement, slightly sleep and awakening in which different metabolic processes occur in the body to promote growth, repair, recovery and care. .3. [Smart Health Ring] As a professional heart consultant, it is equipped with high -precision, high -performance heart rate and oxygen saturation sensors to obtain smart ring, data and monitor your heart activity 24/7. The smart ring will wisely analyze the relationship between your activity and your heart rate. Get a comprehensive understanding of your physical situation. .4. [Various exercise modes and fitness viewer] Smart Health Ring follows your activities with high precision throughout the day. For example, the fitness ring burned your steps, distance walking and calories. In addition, the smart ring has different exercise modes such as walking, running and riding cycling. The ring monitors your activities and points to encourage a more active lifestyle, increase your performance and overcome your limits. .5. [Excessive waterproof] 5atm waterproof technology thanks to all environments you can embrace all environments without worrying. Our smart bracelets are completely sealed for daily with water for swimming, shower and even rainy days, which provides durability, reliability and waterproofing up to 164 feet in any circumstance. .6. [Women's fitness ring] Men's smart ring is made of aluminum alloy, the most comfortable, light, light, only 2.4 grams of weight, basically cannot feel its existence!