1. Display mode: 1.1 inch color OLED screen display2. Display resolution: 96*643. Pulse rate measurement range: 30bpm ~ 250bpm (resolution is 1bpm)4. Accuracy: ±2bpm or ±2% for large values5. Error under weak perfusion: When the pulse filling degree is 0.4%, the oximeter can correctly display the blood oxygen saturation and pulse rate values, the blood oxygen saturation error is ±4%; the pulse rate error is ±2bpm or ± 2% takes a large value.6. Resistance to ambient light interference: The measured value of blood oxygen in indoor natural light and existing illumination source is less than ±1% compared with the measured value under darkroom conditions.7. Power consumption: no more than 30 mA8. Working voltage: DC 3.0V9. Battery: 2 pcs AAA battery 1.5V alkaline 10. Battery working time: 20 hours of continuous operation, the theoretical value is 32