Features: 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. 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. 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. Magnetic fast charging: This Bluetooth-compatible rings uses magnetic charging, which has fast charging speed, long battery life, and APPs can check the real-time battery level. Multifunctional: The Bluetooth-compatible smart rings can measure steps, distance, calorie calculation, heart rate, blood oxygen saturation, blood pressure, sleep tracking, and is multifunctional. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Stainless steel Size: Bracelet size inner diameter mm: Size 8: 18.1mm, Size 9: 18.9, Size 10: 19.8mm, Size 11: 20.6mm Battery Capacity:17mAh Charging Method: Magnetic charging Bluetooth-compatible version: 5.0 Waterproof Level: IP68 Note: 1. Please clean the charging interface regularly to avoid being unable to charge due to dirt. 2. Please take off the rings and clean it after bathing to avoid skin damage caused by toiletries residue inside the rings. Package List: 1 x Bluetooth-Compatible Smart Rings