Color OLED display， simultaneous display for testing value and plethysmogram. - The display interface of OLED can rotate four directions whith six different display modes after pressing the power button for less than 0.5s.- Real-time spot-checks - Pulse waveform & bargraph display - Advanced setting for alarm - Functions of audio alarm and pulse sound - Automatic power off - Low power consumption down to 0.3%- 50 hours continuous to work - Low perfusion ≤0.4% - Low voltage indicator - Widely used in hospital， home healthcare， oxygen bar， community medical centre， alpine area， sports healthcare etc.