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2 or 4 wire smoke detector question.

Subject: 2 or 4 wire smoke detector question.
From: BoyntonStu <stu@xxxxxxxxxx>
Date: Wed, 18 Jul 2007 04:28:31 -0700
Newsgroups: alt.security.alarms

Do any 4 wire units have a built in battery backup as do 110 VAC units?

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