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Question About First Alert Smoke Alarm SA4121B
The unit started to beep and so I removed the back...

The unit started to beep and so I removed the backup battery to replace it. Now I find that I don't know how to replace it and the unit continues to beep. What do I do? It is a First Alert Model # SA4121B.

Asked by Gary on 09/15/2011 0  Answer

ManualsOnline posted an answer 13 years ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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