Accurate ring oxygen monitor, tracks your blood oxygen level, heart rate, and body movements every second automatically. Silent Vibration Prompts you immediately when low oxygen, low pulse rate, or high pulse rate is detected. Record data and store long-term trends on your phone, tablet, laptop, and desktop for free. Print and share four-second interval, high-resolution oximetry reports. Bring great help for a home sleep study. Transmissive Oximetry technology brings great accuracy, which is more sensitive to your body index and more suitable across all finger sizes. No more oppression, the soft silicone material makes it comfortable to wear overnight. USB rechargeable, one fully charged battery can last for two nights(12-16 hours). Integrate with Apple Health & Fitbit,  data on oxygen levels and pulse rate over time gives you a deeper understanding of your body.