smoke alarm

US /smoʊk əˈlɑːrm/
UK /smoʊk əˈlɑːrm/
"smoke alarm" picture
1.

alarme de fumaça, detector de fumaça

a device that detects smoke and sounds an alarm, typically as a warning of fire

:
The smoke alarm went off when I burned the toast.
O alarme de fumaça disparou quando queimei a torrada.
Every home should have at least one working smoke alarm.
Toda casa deve ter pelo menos um alarme de fumaça funcionando.