3. Using the Unit
To cancel a measurement
If you press the O/I or START/STOP button while the cuff is inflating, measurement stops and the arm cuff deflates.
Note: As a safety measure, measurement will stop if any button is pressed.
Important:
If inflation does not stop when the O/I, START/STOP or any other button is pressed,
Press the emergency deflation switch on the back of the unit.
Note: The clock will also stop if you press the emergency deflation switch. Reset the date and time.
Emergency 
deflation switch
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