How accurate is Luna really?
About Luna Ring — IP68 V2 Smart Ring
Elevate Your Lifestyle with Luna Ring
Track your heart rate, sleep, and activity effortlessly. Luna Ring helps you stay on top of your health — all in a sleek, comfortable design. Wear it, live smarter.
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Heart Rate Monitoring
Continuous heart rate monitoring, day and night, for deeper wellness insights whenever you need them.
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Stress & Mood Tracking
Measure your heart rate variability (HRV) to monitor stress levels and better manage your mental wellness.
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Multiple Sports Modes & Activity Tracking
Luna Ring supports 128 versatile sports modes — including 123 standard activities such as running, cycling, walking, skipping,... — ensuring comprehensive tracking for every workout.
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Blood Oxygen (SpO2) Trends
Check your estimated blood oxygen levels throughout the day to better understand your daily wellness patterns.
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Advanced Sleep Tracking
Understand your sleep cycles, including deep, light, and REM stages, for smarter rest and recovery.
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Menstrual Cycle Tracking
Log your menstrual cycle and get simple reminders.
(Note: This function is only available when the profile is set to female mode.)
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Stylish for Any Occasion
Designed to blend seamlessly with both casual and formal wear — it looks like jewelry, works like a smart device.
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Compact and Waterproof Design
Crafted from lightweight, durable materials, Luna Ring is built for all-day comfort and long-lasting use. With an IP68 waterproof rating, it's perfectly suited for all your daily activities.
How to Choose Your Size
Measure Your Finger
(String or Paper Strip)
Step 1:
Wrap a thin strip of paper or string snugly around the base of the finger you'll wear your ring on. Mark where the ends overlap.
Step 2:
Lay the strip flat and measure its length with a ruler. Then match your number to the chart below.
Size 6
57 - 59 mm
Size 7
60 - 62 mm
Size 8
63 - 64 mm
Size 9
65 - 67 mm
Size 10
68 - 70 mm
Size 11
71 - 73 mm
Size 12
74 - 76 mm
Size 13
76 - 78 mm
Note: These measurements reflect your finger's actual circumference — they may vary slightly from official ring sizing charts, since they're based on how your finger is measured in real life, not a rigid metal band.
Pro Tip: If you fall between two sizes, size up — this ensures comfort for all-day wear.
