What is the hush button on a smoke alarm for?

In fire safety industry, Hush Buttons are designed to work with widely available fire alarm  products, the hush button for silencing false alarms, especially smoke detectors
The Test/Hush button is on the smoke alarm cover in General（the smoke detecor also called  hush smoke alarm）, SO What is the hush button on a smoke alarm for?

Smoke alarms are available with a pause or hush button that can be used to temporarily silence the alarm. This is a convenient way to deal with nuisance alarms, such as those caused by burning toast or opening smoky ovens, without disabling the alarm. … The chirping will stop once the alarm resets itself and it is meaning that the smoke alarm is desensitized by pushing the “HUSH” button on the smoke alarm cover.so the hush smoke alarm is very important！

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