Oura Ring smart ring, 4th edition. One of the strongest rings in the market currently. It's smart and makes you independent of the uncomfortable look of a smartwatch. The ring is worn and tracks steps, heart rate, health, sleep, anxiety, stress, and many other things from your body. And if you are a girl, it also benefits you greatly in terms of your monthly cycle. Color: Rose Gold Size: 7 Usage duration: Little Regarding the color, it is changeable. You can put a cover on it from Amazon in many colors. The price, God willing, I will not fall short with the buyer. For your information, I have a charger that charges all sizes, original.