heat detector and a sounder. Additionally, this detector lasts around 7-10 years. Fortunately, it's super easy to replace since you just need to re-hook up the wires to the same spot on the new one, and it should work just as it did before. There is no programming needed, so replacement is a breeze. But if this smoke detector isn't the one you're looking for, make sure to take a look at our other smoke detectors.