Oura ring in silver comes with the extra really cool charger that you would have to buy separate on the website. Size 7 Silver Works great, small scratches. Make sure this is your size. The Oura Ring is a wearable health tracker designed to provide insights into various aspects of well-being. Here's a detailed description: Purpose: Track health metrics and provide personalized insights Monitor sleep quality, activity levels, and stress Features: Sleep Tracking: Measures sleep duration, quality, and sleep stages Activity Monitoring: Tracks steps, calories burned, and movement patterns Heart Rate and Blood Oxygen: Monitors heart rate, heart rate variability, and blood oxygen levels Temperature Tracking: Records body temperature throughout the day Stress and Readiness: Provides insights into stress levels and overall readiness for the day Period Tracking: (For women) Tracks menstrual cycle and predicts periods Technology: Equipped with sensors that use infrared and green light to measure health metrics Uses an accelerometer to track movement Connects to a smartphone app via Bluetooth