Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
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Smart ring in Matte silver, size 10 (19,8). Red and infrared LEDs measure blood oxygen levels; green and infrared LEDs alternately measure heart rate, heart rate variability, and respiratory rate around the clock. A digital sensor measures temperature trends, and an accelerometer tracks movement and activity around the clock.
One charge provides up to 6–9 days of battery life, depending on ring size and intensity of use. Charging takes about 80 minutes, depending on the battery charge level. It is water-resistant up to 100 m / 328 ft and rated IP68 for water and dust protection. The charging case is sold separately.
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