Plan on replacing the 6 volt backup battery before installation. Units, while in new condition, have been sitting on a shelf for quite some time. Ours were date coded 2018, and the packaging shows the shelf wear to prove it. That battery will not likely take a charge; besides, they are past their expiration date. Not a big deal, as replacement batteries are reasonable and available. Still a good value for the money.
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Incredibly fair pricing, would shop here again without hesitation.