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1. Display screen
Display the SpO
2
and SpO
2
measurement trend graph; PR value, PR
measurement trend graph, pulse intensity bar chart, perfusion index (PI) value, pulse
wave, operating state of main unit, measurement duration, user ID, battery level, and
time.
2. Power/Confirm key
Power: Press this key to start the oximeter.
In Menu mode, it serves as the Confirm key.
3. Up key
This key has different functions in different situations. Press this key to move the
cursor upward, increase the value of a menu item, etc.
4. Down key
This key has different functions in different situations. Press this key to move the
cursor downward, reduce the value of a menu item, etc.
5. Multi-purpose multiplex interface
Connect the charging cable or SpO
2
probe.
6. Watchband
7. SpO
2
probe (model: A401-201)
2.3 Product Function List
WS20A
Display screen
SpO
2
PR
Pulse wave
Battery level display
Multi-purpose multiplex interface
Display screen
Adjustable watchband
Down key
Up key
Power key
SpO
2
probe
