Function
1) Display of SpO2 value.
2) Display of pulse rate value and bar graph.
3) Display of PI value (optional).
4) Display of pulse waveform.
5) Battery power indication (optional).
6) Low-voltage indication: the low power indication symbol appears when the voltage is too low to work.
7) Auto Power On.
8) Auto standby.
9) The display mode can be changed (optional).
10) Adjustable screen brightness (optional).
11) PR sound prompt (optional).
12) Sound prompt (optional).
13) Automatic direction-changing function (optional).
