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The OnePlus ring integrates new sleep skin temperature monitoring technology, significantly enhancing the accuracy of monitoring data. This marks a key technological breakthrough in the ring's evolution from a "health record" to a "health prevention" tool. The OnePlus ring sizing differs from standard ring sizes. Use a sizing kit to find the most accurate and comfortable fit for your finger. As an innovator in the wearable field, this smart ring achieves a perfect combination of compact design and multifunctionality. It tracks stress, heart rate, blood oxygen, HRV, and activity metrics, aiming to be an all-day personal health companiontruly bringing "Health at Your Fingertips." Its functions include stress, heart rate, blood oxygen, HRV, sleep tracking, wellness insights, and recovery. This ring redefines the essence of smart wearable devices. It is committed to delivering a liberating and enjoyable user experience. As a skin-friendly wearable device, the ring meets high industry standards, from the coating technology of its titanium exterior to the waterproof treatment of its inner ring. This ensures stable performance in scenarios like swimming pools, gyms, and outdoor adventures, seamlessly integrating into daily life. A single charge provides up to a full week of use. The ring features a unique laminated battery that reduces overall weight. Paired with its exclusive wireless charging case, it keeps up with a busy lifestyle. The OnePlus ring is officially eligible for HSA and FSA purchases. Use your health savings or flexible spending account to invest in advanced sleep tracking, wellness insights, and recovery support. Included items: OnePlus ring*1, Wireless Charging Case*1, 1m/3.3ft USB-C Cable*1, Instruction Manual*1, Quick Guide*1