1. Easy & simple operation 2. Small and light weight (50g including batteries) 3. OLED Display: SpO2, PR,Pleth Bar,Pleth waveform 4. Low power consumption, can work min 30 hours continuously with 2 AAA batteries 5. Automatically power off 8 seconds after usage 6. Low battery indicator 7. Multi-direction display (6 modes) 8. Wide application, suitable hosptial on spot test and home care.