A smoke alarm is the device that sounds when it senses smoke. Test the smoke alarm.
It should be tested monthly, and almost nobody does it until it chirps at three in the morning. A smoke alarm on every floor roughly halves the risk of dying in a house fire.
1nounsmoke alarmThe device that sounds when it senses smoke.
“The smoke alarm had no battery in it for two years.”
smoke alarm is a device.
Practised in Emergency & Rescue