RC20 Waterproof Bluetooth Health Monitoring Smart Ring Stainless Steel Finger Ring,Magnetic Charging Cable - Silver/Size 8 •IP68 waterproof technology: IP68 waterproof performance allows you to rest assured that you are not afraid to wear it,shower,swim,or wash your hands •Health smart ring: With sleep monitoring,blood oxygen,heart rate,blood pressure monitoring function •Magnetic charging: The ring is equipped with a powerful magnetic suction coil,which can be charged by magnetic suction,making charging more efficient •Record exercise data: Real time sync with your phone,accurately grasp your exercise data,and help you achieve daily goals •Specifications: •Size: •Size 7 inner diameter: 17.3mm,finger circumference: 54.4mm •Size 8 inner diameter: 18.1mm,finger circumference: 56.9mm •Size 9 inner diameter: 18.9mm,finger circumference: 59.5mm •Size 10 inner diameter: 19.8mm,finger circumference: 62.1mm •Size 11 inner diameter: 20.6mm,finger circumference: 64.6mm •Size 12 inner diameter: 21.4mm,finger circumference: 67.2mm •Material: Outer surface material: stainless steel,main body material: epoxy resin •Compatible system: Android 5.0 and above; Hongmeng system is supported; IOS 10.0 and above •Storage capacity: It is recommended to connect to the app and sync data every day. The ring can store up to 15 days of data,depending on the type and frequency of use •Battery capacity: 20mAh •Battery life: 3 to 5 days,depending on the frequency of use •Charging method: Use the included charging cable (USB rated 5V) •Light sensor: LED is in visible color range,safe and user-friendly •Connection method: Low-power Bluetooth 5.0 •Product weight: about 5.0 grams •Software program update ability: Updated via software application •Waterproof level: IP68 •Charging port: Magnetic charging with short circuit protection •Charging time: about 30 minutes •Main functions: Exercise monitoring,sleep monitoring,multiple exercise modes,heart rate monitoring,blood oxygen monitoring,blood pressure measurement and monitoring,remote care •APP supports languages: Russian,Hungarian,Turkish,German,Italian,Czech,Slovak,Japanese,French,Polish,Persian,Simplified Chinese,Traditional Chinese,English,Portuguese,Spanish,Vietnamese,Arabic,Korean,Thai; 20 languages Package included: •1 x Smart Ring •1 x Magnetic Charging Cable •1 x English and Chinese User Manual