Every year over 600 people die in fire accidents, usually inside their own four walls, from smoke poisoning. For the two thirds of these people who will be surprised in the night while sleeping, a smoke detector's prompt, loud alarm is the best lifesaver in the home to warn of a fire hazard.
FAQ - Smoke Alarm
Can I test the smoke detector myself?
Yes, press the device until a beep sounds. If there is no beep, the device needs to be repaired or replaced.