I've been using this for about two weeks, but the size doesn't fit, so I'm going to exchange it for a different size. (Size is M (US size 10)) This is my second smart ring, and it costs nearly 50,000 yen (49,900 yen), so the accuracy and wide range of measurements are very high, and I think it's reliable. However, the battery life is only about 3 days, which is a bit of a downside. Also, since it's made of titanium, it doesn't scratch easily like stainless steel, which I think is a good point. I also like the subdued, fine-dotted gold color, which makes it less noticeable. I use a Garmin smartwatch, but thanks to the ring, I can take it off when I sleep! If you're interested, please consider it. [Product Description] Gold Amazfit Melio Ring with fitness data tracking function, with original box. - Brand: Amazfit - Model Name: Amazfit Melio Ring - Color: Gold - Package: With original box - Features: Fitness data tracking function Thank you for viewing. #SmartRing