SR08 Digital Display Smart Ring Sleep Tracker Blood Oxygen Heart Rate Monitor Ring ( Magnetic Cable Charging ) - Bright Silver or Size 9 ¡¾Smart Health Tracking¡¿This intelligent ring monitors sleep patterns,blood oxygen levels,and heart rate,providing comprehensive health insights ¡¾Durable and Waterproof¡¿Crafted with stainless steel and featuring IP68 waterproof rating,this ring is built to withstand daily wear and water exposure ¡¾Long Battery Life¡¿With a 16mAh polymer pure cobalt battery,enjoy 3-4 days of normal use or up to 20 days on standby ¡¾Bluetooth 5.1 Connectivity¡¿Seamlessly sync your data with the Jring app,compatible with Android 9.0and and iOS 10.0and devices ¡¾Quick display¡¿Touch the side button to display time,steps,heart rate,blood oxygen,sleep,battery level and other data to remind you at all times Specifications: Waterproof rate: IP68 Material: Stainless steel and glue filling process Size: 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 DA14585 Memory (ROMandRAM): 128kb ROM and 96 Kb RAM G-Sensor: SC7A20 Bluetooth Version: 5.1 MobileAPP-GPS: Yes Heart rate sensor: HX 3918 Battery Type: Polymer pure cobalt battery Battery Capacity: 16mAh Operating temperature range: 0-50¡æ Charging time: 2 hours Theory Standby time: 16 days-20 days Normal using time: 3-4 days Compability: Support Android 9.0 and above for Apple IOS 10.0 and above Compability Software: Jring Multi-sport mode: Multiple sports modes Package included: 1 x Smart Ring 1 x Magnetic Charging Cable 1 x English User Manual