Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number:R09 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 Item Weight:3.5g Certification:ce Battery Capacity(mAh):15mAh Color:Silver, Gold, Black App:QRing Type:Smart Ring For Men Women Bullet Points: APP:Qring Chipset: RTL8762 ESF Memory:RAM 104KBROM 512 KB BT: BT5.2 Waterproof grade:5ATM Body MaterialStainless Steel Battery: 15mAh Lithium polymer Charging MethodMagnetic charging warehouse Charging Time: About 1.5 hours Normal Using Time: 5-7 days (depending on personal habits) Standby Time: 7days-10days AuthenticationCE;FCC;RoHS Supported Systems :Android 5.0 and above iOS 10.0 and above Functions 1> Health management: Heart rate measurement, blood oxygen saturation, HRV heart rate variability, stress, sleep tracking, multiple exercise modes, skin temperature measurement 2> Exercise Record: Steps, Distance, Calories, 3> Other functions:Remote control photography, ring searching, female physiological reminders Note: 1. For best performance and accuracy, we recommend wearing the Smart Ring on your index finger. If you prefer other fingers, the middle and ring fingers are also OK. Avoid using fingers that are narrower than the knuckles at the base. 2. The size of R09 ring may not be completely in line with universal standards. Please measure your finger circumference before purchasing and make sure it fits comfortably, then choose the appropriate size. 3. How to start: Use the included charging cable or charging case to charge R09 Ring. The heart rate light will light up to indicate successful startup. Then you can use the APP Qring to connect the R09 Ring. 4. Some models have a protective film on the charging port. Please remove the protective film before charging. Warm tips Waterproof: It is just life waterproof. It is not allowed to soak the smartring in water! (Please be careful to avoid corrosive liquids like hand sanitizer, soap enter the smart ring and cause component damage.)