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The Night Aurora Luna is a lightweight smart ring that tracks sleep, heart rate, stress, blood oxygen, activity and menstrual cycles, then summarizes it through a built-in AI assistant. Its 2mm profile and 2.5g weight make it easy to wear overnight and during workouts, and IP68 water resistance covers swimming and showers. It competes with rings like the Oura Ring on the same core metrics, but its sizing follows its own standards rather than standard ring sizes, so fit needs care. Buyers who want passive health tracking without a watch screen are the target; those who want a display or app-heavy coaching should look elsewhere.
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The Night Aurora Luna Smart Ring NA01 is a smart ring that uses multiple sensors to continuously track sleep, heart rate, stress levels, blood oxygen, physical activity and menstrual cycles. A built-in AI assistant provides a personalized report and guidance on wellness and daily habits.
The ring has a super-thin 2 mm profile and weighs only 2.5 g. It is designed to stay out of the way during workouts, running, diving and other physical activity, as well as during sleep and work. It has an IP68 rating.
The ring uses its own sizing standard, which is different from standard ring sizes. Check the sizing before you buy.
