【Fitness Tracker】: The fitness tracker ring records your exercise data and automatically monitors your heart rate and HRV every half hour, or manually through the app. Blood oxygen saturation and stress tests are measured manually via the app. 【Sleep Tracker】: The sleep monitoring function will automatically record sleep data from 10:00 pm to 8:00 am. A sleep tracking ring is your ideal health companion, and our smart rings for men and smart rings for women are both great choices. Smart ring health tracker data can be easily viewed via the mobile app. The smart ring supports Android 5.0 and iOS 10.0 and above systems. 【Titanium Alloy Material】: The smart ring is made of lightweight, skin-friendly, high-strength titanium, ensuring excellent workmanship and durability.