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O2Ring Finger Oxygen Monitor,Wearable Pulse Oximeter for Heart Rate and Sleep Health Tracking This unique design is accentedO2Ring Finger Oxygen Monitor,Wearable Pulse Oximeter for Heart Rate and Sleep Health Tracking Wellue O2Ring Patented Wearable O2 Tracker Sleep with Peace of Mind Using intelligent SOC chip, combined with anti interference filtering technology, O2Ring provides accurate oxygen saturation level and pulse rate measurement in real time. Wear this ring sense, it will automatically start to track your overnight blood oxygen saturation, heart rate and body