Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number: R11 Display screen:No NFC Support:No Activity Tracked:Activity Tracker,Steps Tracker,Distance Tracker,Calorie Tracker Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor,Stress Monitor Item Weight:About 5g Case Material:Ceramic Certification:ce,FCC Brand Name: Battery Capacity(mAh):15~18 mAh Smart Ring No.1 in sales on AliExpress, and is far ahead. Note: 1. For best performance and accuracy, we recommend wearing the R11 on your index finger. 2. Please measure the circumference of your finger before purchasing, and make sure the rope or paper strip fits snugly against your finger, avoiding being too loose or too tight. (Please use a thinner piece of string or paper strip to measure the size. If the measuring tool is too wide, the measurement will be large.) 3. How to start: Use the included charging case to charge Ring. The heart rate light will light up to indicate successful startup. Then you can use the APP Da Rings to connect the R11. 4. The charging case of R11 has a protection mechanism, and it can only be charged when the cover is closed. R11 - Addictive Smart Ring Revolutionary Rotating Design: Your Portable Stress Reliever. The R11 is not just a smart ringit's your personal anxiety relief tool. Featuring a unique rotating mechanism, it allows you to channel stress and anxiety into a calming, tactile experience. Perfect for moments of focus or relaxation, wherever you are. Comprehensive Health Management at Your Fingertips. Stay on top of your health effortlessly. The R11 tracks vital metrics like heart rate, sleep patterns, and activity levels, empowering you to take control of your well-being with data-driven insights. It's like having a personal health assistant on your finger. Ultra-Long Battery Life with Convenient Charging Case. No more frequent charging. The R11 comes with a sleek charging case, delivering an incredible 60 days of battery life. Whether you're at home, on a trip, or always on the move, the R11 is ready to support your lifestyle. Experience innovation, convenience, and wellness with the R11. official store Authentic smart watch are engineered and manufactured with high-quality materials, and they're always quality-tested before they leave our factory. Since counterfeit or fake devices are not built or tested to these standards, they might perform poorly or malfunction. So, we recommend buying devices sold only by our official store. Brand Story was established in 2012. Slogan: Your first smart watch. Young and simple, but never naive. Mission: Provide cost-effective smart electronics.