1. Material: ABS2. Applicable parts: hands3. Working current: ≤30mA4. Power supply voltage: 2.6~3.6V5. Automatic shutdown if no signal for more than 8 seconds6. Display: OLED two-color display, waveform display7. Detect pulse rate and blood oxygen saturation by finger8. The volume waveform is displayed to ensure accuracy9. Suitable for: medical, sports and daily home care equipment10. Self-adjusting finger clips and simple one-button design for easy operation11. 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 time13. Blood oxygen measurement range: 70~99%, resolution: ±1%, accuracy: ±2% (70%~99%), unspecified (14. Heart rate measurement range: 30~240 bpm, resolution: ±1%, accuracy: ±2bpm or ±2% (select larger)15. Size: 58x33x36mm16. Net weight: 30g

http://olla.gr/finger-clip-oled-screen-pulse-oximeter-colour-white-english-neutral-packaging/