After extensive research I decided to purchase this unit and I’m glad I did. I wanted the following features in my CO Detector, and this unit meets those requirements. It must be AC powered with battery backup, have a digital display, use AA batteries, not the expensive 9 volt, have an AC power cord so the unit can be located away from the AC plug-in if necessary, have a long warranty (7 years) from an established company, and be competitively priced. The only possible negative feature I can see is that the front battery cover is hinged on the bottom. The battery cover retaining latch seems to be rather flimsy, and if it were to break, the battery cover would flip open. The cover hinge should have been placed on the top of the unit or a better latch system used. Hopefully with careful use the latch will not break. It should be noted that the unit has a built in “in-use” timer that will alert the user and disable the unit after 7 years of operation.
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