SR03 Ultra Thin Multi-function Health Monitoring Smart Ring with Charging Case,Style B - Middle Gold/Size 11 •Comfortable and lightweight wearing experience,multiple sizes •Ultra-long battery life,equipped with a charging case,10-15 days of standby,10 days of use,the charging case can fully charge the device 8-10 times •Multiple health modules,such as blood oxygen,heart rate,sleep,it can provide detailed insights and professional analysis reference Specifications: •Waterproof: 5ATM •Material + process: stainless steel + potting process •Size: • 7 (inner diameter 17.4mm) • 8 (inner diameter 18.2mm) • 9 (inner diameter 19.0mm) • 10 (inner diameter 19.9mm) • 11 (inner diameter 20.7mm) • 12 (inner diameter 21.5mm) •Thickness: 2.5mm •Chipset: Dialog DA14531,ultra-low power consumption,more durable •Memory: 128Kb ROM + 96Kb RAM •G-Sensor: SC7A20 •Bluetooth Version: 5.1 •MobileAPP-GPS: Yes •Heart rate sensor: Tianyi 3602 •Battery Type: Polymer pure cobalt battery •Operating temperature range: 0-50℃ •Battery Capacity: About 17.5mAh •Charging time: 2 hours •Theory Standby time: 10-15 days •Normal using time: 10 days •Charging: Magnetic charging + charging box •Compability: Support Android 5.0 and above; Apple IOS 10.0 and above •APP: JYOUPRO •Heart rate: APP initiates heart rate test/all-day dynamic heart rate trend and data analysis/heart rate data analysis/recent 7 heart rate measurement trends/heart rate history data •Sleep: sleep data statistics,sleep ratio,sleep score,sleep analysis,average sleep heart rate,etc. •Blood oxygen: APP initiates blood oxygen test/recent 7 blood oxygen data/recent 7 blood oxygen saturation measurement trends/blood oxygen history data •Operation: The ring has no touch and no buttons; App initiates exercise and function test Package included: •1 x Smart Ring •1 x Charging Case •1 x Charging Cable •1 x English User Manual