请教：家里的屋顶上的报警器总是过一会就响一下，以为是没电了，可是打开看看，好像没有电池，有没有人知道是怎么回事？多谢了。
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There are two types of alarm, the one you have is without battery.
I have the same situation with you before, I brought the old alarm to Canadian Tire, I was told to buy the same type of alarm to replace old one at home, then it works since then.
There are two types of alarm, the one you have is without battery.
I have the same situation with you before, I brought the old alarm to Canadian Tire, I was told to buy the same type of alarm to replace old one at home, then it works since then.
