This smart ring is designed to track various health metrics, including sleep, activity, recovery, and stress levels. Here are some key features: Biometric Tracking: Monitors over 20 biometrics with precision. Compatibility: Works with iOS and Android, integrating with apps like Apple Health, Google Health Connect, and more. Wore under a dozen times. Works great! Amazing technology. I just do not like to wear rings. Size 8 Silver finish Gen1