auto-off device
nounUK /ˌɔːtəʊ ˈɒf dɪˌvaɪs/
US /ˌɔːtoʊ ˈɔf dɪˌvaɪs/
A thing that turns itself off after a while.
The lamp has an auto-off device so it won't stay on all night.
RELATED WORDS
OTHER MEANINGS
2. A safety feature that cuts power when something goes wrong.
The heater's auto-off device stopped it from overheating.
3. A setting that saves battery by turning the screen off.
My phone's auto-off device darkens the screen after a minute.
4. A gadget that stops a machine when no one is using it.
The fan's auto-off device clicked on when the room emptied.