Thank you for viewing. This is a beautiful item used for about two days. It is sold out on the official website. □ Product Description ● Heart rate accuracy comparable to a chest strap, and seamless integration with Amazfit devices. ● High-precision heart rate tracking. ● Long battery life of up to 10 days. ● Core features that do not require a subscription. ● 24-hour recovery tracking. ● Automatic recognition of 5 sports. ● Compatibility with Amazfit smartwatches. ● Compatible with iPhone/Android.