Features:_x005F_x000D_Advanced Health Monitoring: The Smart Rings tracks heart rate, blood oxygen levels, stress levels, and sleep quality seamlessly, ensuring you stay informed about your health status effortlessly._x005F_x000D_Water Resistance: With 5ATM waterproof, the rings can be worn worry-free in various conditions, including swimming and showering._x005F_x000D_Real-Time Exercise Monitoring: Supports multi different exercise modes, providing real-time heart rate data during workouts to help optimize your fitness routine._x005F_x000D_Stylish and Innovative: Combines cutting-edge technology with a stylish design, making it a perfect accessory for health-conscious individuals._x005F_x000D_Notice:_x005F_x000D_1.Actual color may be slightly different from the image due to different light effect_x005F_x000D_2.Please allow 1-3cm deviation due to manual measurement_x005F_x000D_ _x005F_x000D_Description:_x005F_x000D_Weight: 3g_x005F_x000D_Material: Steel_x005F_x000D_Support: Support Androids 5.0 and above; Apple-I0S10.0 and above_x005F_x000D_Inner diameter:_x005F_x000D_7: 17.6mm_x005F_x000D_8: 18.4mm_x005F_x000D_9: 19.2mm_x005F_x000D_10: 20mm_x005F_x000D_11: 20.8mm_x005F_x000D__x005F_x000D_Package List:_x005F_x000D_1x Multifunctional Health-Tracker Smart Rings_x005F_x000D__x005F_x000D_