•Lightweight: Comfortable and senseless wearing experience and extremely light weight make it stand out from other smart wearable products •Sleep monitoring: When you fall asleep,the ring automatically monitors your sleep quality and generates sleep reports to help you develop good sleep habits •Heart rate monitoring: Adopting advanced dynamic monitoring technology to accurately record changes in your heart rate,allowing you to understand your own health status anytime,anywhere •Deep waterproof: Fully enclosed structure,depth waterproof technology,swimming,diving or snorkeling can be worn,to meet your various waterproof needs Specifications: •7 : Circumference: 54.4cm,Diameter: 17.3cm •8 : Circumference: 56.9cm,Diameter: 18.1cm •9 : Circumference: 59.5cm,Diameter: 18.9cm •10 : Circumference: 62.1cm,Diameter: 19.8cm •11 : Circumference: 64.6cm,Diameter: 20.6cm •12 : Circumference: 67.2cm,Diameter: 21.4cm •Bluetooth-compatible Version: BLE5.0 •Ring Battery Capacity: 20mAh polymer lithium battery •Standby Time: 5-7 days •Charging Method: Wireless charging base •Charging Time: 2-3 hours •Main Chip Model: FR8016HA •Heart Rate Sensor Model: HX3605 •Protection Level: IP68 •Charging Dock Battery Capacity: No battery,requires Type-C cable •Ring Case Material: Stainless steel •Fitness Features: Distance/Calories/All-day step tracking •Heart Rate: Automatic timed heart rate tests,daily/weekly/monthly results,upper and lower limit alerts for abnormal data •Sleep: Sleep data statistics,sleep ratio,sleep score,sleep analysis,average heart rate during sleep,daily/weekly/monthly results •Blood Oxygen: Automatic timed SpO2 tests,all-day SpO2 charts,trend of the last 7 SpO2 measurements,SpO2 history,daily/weekly/monthly results •Stress: Automatic timed stress tests,all-day stress test charts,stress history,daily/weekly/monthly results •Other Settings: Unit format,low battery alert,abnormal data warning,segmented data viewing,cloud data sync options •Platform Access: Own platform •OTA Upgrade: Supported •Operation Method: Timed sensor detection of body data,no touch,no buttons •App Languages: Chinese,English,Arabic,Danish,German,French,Dutch,Czech,Romanian,Portuguese,Japanese,Spanish,Italian,Russian,Turkish,Persian,Traditional Chinese,etc. (17 languages) •Compatible Systems: Android 5.0 and above; iOS 10.0 and above •App Name: JSRing Package included: •1 x Smart Ring •1 x Type-C Cable •1 x Charging Base •1 x Storage Bag •1 x English User Manual