fire alarm
smoke alarm

We caught it just in time, before the smoke alarms did.

Install a working smoke alarm on every level of your home.

He also found a hidden camera in a smoke alarm.

The researchers found that almost all homes now have smoke alarms.

Every home should be equipped with one or more working smoke alarms.

Along about this time my smoke alarm finally kicked in.

I've got to close the door before the smoke alarms go off.

The older wing did have working smoke alarms, officials said.

The couple say that their smoke alarm, provided by the council, wasn't working.

But I could hear the smoke alarm in the background.