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|It is a perfect item for protecting your family from the danger of carbon monoxide and very easy to read with the digital dispaly, even in a low light condition. Alarm memory feature: If the unit ever alarms, pressing the button, green LED will flashes once every second for one minute and the peak alarm level will be indicated on the LCD. Green LED:Flashes every 30 seconds to indicate the unit is operating properly. The green LED will also flash before CO reading is taken and when any button is pressed.|