The manufacturer (Kidde) recommends replacing this Carbon Monoxide detector every 7 years. That may seem like an expensive proposition, but I feel it's worth it to have peace of mind for my family's safety. Just be sure to purchase a unit that was manufactured recently, since it isn't clear just when that 7 year time period starts. I suspect that they mean it is from the first power-up, and an older unit will notify you when it has expired, but I like to get the most for my money. I know of another person that bought an older unit and it did not work for him, so I want to avoid just such a situation.
Overall, I've been pretty happy with KN-COPP-3 Nighthawk -- as much as you can be from a product of this sort. I've not had any low battery error messages experienced by some other reviewers. It should be obvious, but I suspect some people may not realize the battery is just for back-up and the unit needs to be plugged in. The small power brick is inside a back panel next to where you install the battery, and you can change its orientation if you want to plug in the Nighthawk in at a different angle. If you don't want the somewhat large detector cluttering up an outlet, the brick is also removable with a 6 foot cord. On the plus side, the unit was well designed so that it wouldn't block the second outlet.
After installing and testing the Nighthawk, it now resides on a wall, happily blinking away (this means all systems are go). Thankfully, I've never seen an indication of high CO levels in the house. If there were, I'm confident we'd hear the warning because the unit's alarm is LOUD! I only hesitate to give the Nighthawk my full endorsement because there are purely battery powered CO detectors available for less. These offer the added utility of not having to be in or near an outlet. Also, look around for specials before purchasing. I found this unit specially packaged with a smoke detector for half its current cost on Amazon.
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