Its alarm is,
In case gas leak;
Woo---! Woo---! Pippippippi! Isn't gas leaking?
In case imperfect combustion occurs (CO is increasing);
Woo---! Woo---! Pippo Pippo! The air is foul and it's dangerous. Open the window to ventilate.
Very big noise. I live by myself so there is no person in the room in the most time. If it alarms while I am out, I wonder if it continues to alarm with such big noise.
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