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It is widely used in homes, hospitals, oxygen bars, sports care (used before and after exercise, not recommended during exercise), and community medical care. Suitable for high altitude tourism and mountaineering enthusiasts, patients (long-term home-grown patients or patients in emergency situations), elderly people over 60 years old, people who work more than 12 hours a day, athletes (professional sports training or sports enthusiasts), Confined environmental workers, etc. This product is not suitable for continuous monitoring of the patient. Blood oxygen saturation measurement range: 70%~99% Oxygen saturation measurement accuracy: ±2% within the range of 70%~99%, ≤70% is not defined Oxygen saturation resolution: 1% oxygen saturation Sleep monitoring time: 130R: None, 131R: 8 hours automatic shutdown: 8 seconds automatic shutdown when no finger is inserted Storage humidity: 15%~80% working, 10%~80% storage battery model: 2*1.5V (2 AA alkaline, product does not contain battery) Pulse rate range: 30BPM-240BPM Pulse rate accuracy: ±1BPM or ±1% of the measured value (larger value) Blood perfusion index: ≥0.2%, ±0.1% Power consumption: less than 30mA Operating temperature: 5C~40°C Atmospheric pressure: 70Kpa~106Kpa Material: ABS+PC