Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number:R11 Display screen:Yes NFC Support:No Activity Tracked:Steps Tracker,Distance Tracker,Calorie Tracker,Activity Tracker Metrics measured:Heart Rate Monitor,Sleep Monitor,Blood Oxygen Monitor,Stress Monitor Item Weight:0.1kg Case Material:STEEL Certification:ce Brand Name:KGG Battery Capacity(mAh):15mAh Parameter: ChipsetRealtek Chipset ModelRTL8762 ESF Compatible systemAndroid5.1or above, iOS8.0 or above FLASH memoryRAM104KB FLASH 512KB TouchYES BT5.2 BLE (Bluetooth Low Energy) SensorST LIS2DOC Heart Rate SensorVcare VC30F-S Battery typeLithium polymer Capacity15mAh (18mAh for size 11 and above) Charging modewireless charging/charge box(up to your choice) Dust Proof & Waterproof Level5ATM Charging timeAbout 1.5H Product Materialstainless steel APP: QRing Feature: Major function > Daily activities: Step count, distance, calorie calculation 2> Health management: heart rate measurement, blood oxygen saturation, sleep tracking, multiple exercise modes, stress, heart rate variability 3> Touch function: single point switching display function 4> Display: time, steps, heart rate, battery level, likes count 5> Other functions: remote control for taking photos, searching for rings, gesture control, gaming, female cycle App software features: Step count, sleep monitoring, heart rate tracking, exercise data records Health monitoring, pressure, blood oxygen measurement Multiple sports modes, photography APP Supported languages: Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Trkiye, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay Note: 1. For best performance and accuracy, we recommend wearing the Ring on your index finger. If you prefer other fingers, the middle and ring fingers are also OK. Avoid fingers where the base is narrower than the knuckle. 2. The size of rings 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: Charge the Ring with the included charging cable. The heart rate light will light up to indicate successful startup. Then you can use the APP Qring to connect the Ring. 4. Due to different display and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. Please allow 1-2cm measuring deviation due to manual measurement, thank you! Detailed Pictures: