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Once the alarm goes off - and you press the snooze button, it starts an internal timer for a given period (usually 6-10 minutes depending on the manufacturer). Once the internal timer reaches zero, the alarm is triggered again and the snooze timer resets to its original period. You can usually hit the snooze button indefinitely, but to silence the alarm for good, you need to switch the alarm off.

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Q: How does a alarm clock with a snooze button work?
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