To Stop A Tone/Vibration Alert Operation - Casio GB-6900B User's Manual For Watch Functions

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Even if you exit the Timer Mode while a timer countdown is ongoing, the
countdown will continue and the tone/vibration alert operation will be
performed when the end of the countdown is reached.

To stop a tone/vibration alert operation

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. D ouble-tapping.the.center.of.the.watch.display.or.pressing.any.one.of.the.
buttons.will.stop.an.ongoing.tone/vibration.alert.operation.
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