 You've got to replace it with a wire detector, and, of course, it will have a battery backup inside. Now, my house was built in 73, so we didn't have wired smoke detectors in those days. So I have battery detectors upstairs and down, and that's fine. They're UL approved, and all the agencies have approved them. And I have a Kitabrand dual detector in my house, and that's what I want you to get. So that's the deal. They just get less sensitive dust, cobwebs.