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 Version: BLE5.0 Ring Battery Capacity: 20mAh polymer lithium battery Charging Case Battery Capacity: 450mAh Standby Time: 5-7 days Charging Time: 2-3 hours Main Chip Model: FR8016HA Heart Rate Sensor Model: HX3605 Protection Level: IP68 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 Case 1 x Storage Bag 1 x English User Manual