1. Smart ring with blood pressure, sleep tracker, heart rate monitor, SpO2: The ring measures heart rate, blood pressure, and oxygen levels. It can activate continuous 24hour heart rate monitoring easily. At night, the intelligent sleep function accurately records your sleep cycles and quality, including the distribution of light and deep sleep, helping you develop better sleep habits. 2. Only 3.8 g, elegant smart ring for women: This stylish, refined, and sporty ring weighs just 3.8 grams. Whether typing in the office, sweating at the gym, or exploring the outdoors, the ring remains unnoticeable on your finger. Its ultralightweight design enhances comfort and allows you to perform at your during any activity. 3. IP68 waterproof: Suitable for handwashing, showering, splashes, and rain. Not recommended for hot baths, diving, or underwater work. Avoid extreme hot or cold environments. This multifunctional fitness ring acts as a fullfeatured pedometer, accurately tracking daily activity data like steps, distance, and calories. It also supports various sports modes, including walking, running, and cycling. 4. Please measure before : Before buying, ensure precise finger measurements. We recommend measuring in the afternoon or early evening when fingers naturally expand slightly for a more accurate fit. Once sized, you can select the fitnesstracking smart ring.