R8 SIZE 16 Smart Ring, Support Heart Rate Blood Oxygen Sleep Multiple Sports Modes About Product 1. Material: ceramics+steel 2. Main Chip: NORDIC NRF52832-CIAA 3. Chip: SY8602 4. Sensor: QMA6100P 5. Battery: 23mAh,3.74.2V lithium battery 6. Sports Measure:Calories, Steps, Mileage 7. Sleep Monitor: 20:00-8:00 8. Multi-sports modes:Running, cycling, skipping rope, fitness, mountaineering, yoga, golf, dance 9. Heart Rate checking, blood pressure, Blood oxygen, Fitness track 10. Charging mode:Magnetic Charging Cable,case charging 11. The APP system requires Android: 6.0 or above,IOS: 11.0 or above 12. Bluetooth version:5.2 13. Charging voltage: 4.6~5.2V 14. APP name: SmartHealth 15. Dust Proof & Waterproof Level: IPX8 16. APP Language: English,Simplified Chinese,Chinese traditional,Russian,Ukrainian,German,French,Italian,Spanish,Portuguese,Polish,Greek,Romanian,Hungarian,Turkish,Czech,Slovak,Irish,Croatian,Swedish,Danish,Finnish,Arabic,Hebrew,Persian,Norwegian,Japanese,Korean,Thai,Vietnamese 17. Size 16: Outer Diameter 22mm; Inner Diameter 15.4mm Packing List: Smart ring x1 Charging case x1 User manual x1 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin