Features:_x000D_High-quality materials: Made of high-quality materials, they are wear-resistant and sturdy, not easy to break, and can be used for a long time._x000D_Mobile APPs control: The mobile APPs can view monitoring data in real time. The APPs needs to be connected to the rings through Bluetooth-compatible on the mobile phone. Keep the Bluetooth-compatible turned on. The Bluetooth-compatible will automatically connect when the APPs is started. When not connected to a mobile phone, the rings can also independently monitors the body, record blood oxygen and heart rate status, and update the data in the APPs after being connected._x000D_IP68 waterproof level: The Bluetooth-compatible rings adopts a fully enclosed structure and IP68 waterproof technology, which can easily cope with daily waterproofing. It can be worn for swimming, hand washing, raining, etc. to meet your various waterproof needs._x000D_Multifunctional: The Bluetooth-compatible smart rings can measure steps, distance, calorie calculation, heart rate, blood oxygen saturation, blood pressure, sleep tracking, and is multifunctional._x000D_Notice:_x000D_1.Actual color may be slightly different from the image due to different light effect_x000D_2.Please allow 1-3cm deviation due to manual measurementMaterial: Stainless steel_x000D_Size: Bracelet size inner diameter mm:_x000D_Size 8: 18.1mm, Size 9: 18.9, Size 10: 19.8mm, Size 11: 20.6mm_x000D_Battery Capacity:17mAh_x000D_Charging Method: Magnetic charging_x000D_Bluetooth-compatible version: 5.0_x000D_Waterproof Level: IP68_x000D_Note: 1. Please clean the charging interface regularly to avoid being unable to charge due to dirt._x000D_2. Please take off the rings and clean it after bathing to avoid skin damage caused by toiletries residue inside the rings.Package List:_x000D_1 x Bluetooth-Compatible Smart Rings