It is the battery version but it fits the existing bracket of my old USI-1208 wired version.
October 12, 2020
Great product. Customer support outstanding.
May 26, 2020
Like the product thank you
March 5, 2019
Bought these to replace my 10 year old detectors of the same brand. They fit perfectly into the older units mounting brackets and save me that much more time on the installation...just pop in the battery and twist on the unit.
April 28, 2016
So glad to find an identical unit to our old one.
April 6, 2015
just perfect and easy to get it done.
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