Features: 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. Water Resistance: With 5ATM waterproof, the rings can be worn worry-free in various conditions, including swimming and showering. Real-Time Exercise Monitoring: Supports multi different exercise modes, providing real-time heart rate data during workouts to help optimize your fitness routine. Stylish and Innovative: Combines cutting-edge technology with a stylish design, making it a perfect accessory for health-conscious individuals. 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 Weight: 3g Material: Steel Support: Support Androids 5.0 and above; Apple-I0S10.0 and above Inner diameter: 7: 17.6mm 8: 18.4mm 9: 19.2mm 10: 20mm 11: 20.8mm Package List: 1x Multifunctional Health-Tracker Smart Rings