Test those smoke and carbon monoxide detectors also for that monthly test.
The USFA notes, "One of the best ways to protect yourself and your family is to have a working smoke alarm that can sound fast for both a fire that has flames, and a smoky fire that has fumes without flames. It is called a ‘Dual Sensor Smoke Alarm.’ A smoke alarm greatly reduces your chances of dying in a fire."
It simple, the only good smoke detector is one that works. BEEP-BEEP-BEEP A Sound You Can Live With! Learn Not To Burn, Be Fire Safe!