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FDA registered ring oxygen monitor takes the worry out of night time. 1. Track heart rate & oxygen levels every second continuously with medical grade. 2. Vibrate immediately when low oxygen, high or low heart rate detected. 3. Print or share professional APP & PC oximetry reports with your doctor. 4. Reports in PDF/CSV format like sleep lab used, unlimited and at no cost. 5. Rechargeable. As a reminder, the Wellue O2Ring is designed to provide helpful information about breathing performance; it