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Review title: Universal installation
Product review: The best part about this detector is that it runs on AC power, with a battery backup, BUT YOU DON'T HAVE TO HOOK IT UP TO AC FOR IT TO WORK! We had moved into a new house, and when the battery went dead, we realized it was the only detector in the entire house. So, we ordered this one from Amazon, had it overnighted, and as soon as we got it, were able to put it up on the wall to start working, and we got around to hard wiring it into the power later that week. Chances are, we would have been without any detector for even longer, if this one hadn't been so easy to set up at first. Great install!
