Purchased on 2025.11.14!! 【Brand New, Unused】✨ It's approximately size 16 (Japanese size), perfect for the thumb! Multiple Health Management Measurement Functions Just by wearing the smart ring, you can measure health data such as heart rate, steps, blood oxygen levels, sleep state, and calorie consumption. IP68 Waterproof. Wear it in the water You don't need to take off the smart ring for daily showers or in the swimming pool. Only 3g The main body is only 3g, making it easy to use. It won't be a burden even if you sleep with it on.