你所需要的
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The First Alert Smoke and Carbon Monoxide Alarm. There when you need it, also there when you don't need it and the batteries are low.
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You're going to want to get a flat head screwdriver and pry open the clip on the inside to get to the inner part of the alarm.
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Now what you should do is pop a small screwdriver into the rivet hole to unlock the battery holder.
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Now with the the battery back area being popped out you can safely take out the ringer and the mother board of the smoke detector.
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