How do I temporarily silence the alarm without turning it off?
When the detector is in alarm condition and the CO concentration is less than 200 PPM, press and hold the TEST button to enter alarm silence mode. In this mode, the buzzer will temporarily stop sounding, but the Alarm indicator will continue to flash. The silent mode lasts less than 10 minutes, and pressing the TEST button again will immediately restore the full alarm condition.
From the official Airam 7126612 Carbon Monoxide Alarm Detector manual, page 3
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