1. Material: ABS 2. Applicable parts: hands 3. Working current: ≤30mA 4. Power supply voltage: 2.6~3.6V 5. Automatic shutdown if no signal for more than 8 seconds 6. Display: OLED two-color display, waveform display 7. Detect pulse rate and blood oxygen saturation by finger 8. The volume waveform is displayed to ensure accuracy 9. Suitable for: medical, sports and daily home care equipment 10. Self-adjusting finger clips and simple one-button design for easy operation 11. Power supply mode: 2 AAA alkaline batteries (shipped without batteries) 12. Small size, easy to carry, suitable for daily use, measuring health status at any time 13. Blood oxygen measurement range: 70~99%, resolution: ±1%, accuracy: ±2% (70%~99%), unspecified (<70%) 14. Heart rate measurement range: 30~240 bpm, resolution: ±1%, accuracy: ±2bpm or ±2% (select larger) 15. Size: 58x33x36mm 16. Net weight: 30g