Sigma PC 22.13 Woman User Manual page 7

k LOCK – activate button lock:
the buttons on the PC 22.13 can be locked if necessary.
to do this, set LoCK to on.
Note: the buttons are automatically locked when you
switch to sleep mode (the time and date are displayed).
If you wish to start training, you must press any button
twice within three seconds.
If you accidentally press a button, the message
"PUSH oPen" appears on the display for three seconds
before reverting back to the time.
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