self activating
/ˌsɛlf ˈæktɪveɪtɪŋ/
adjective
- Starting to work or function on its own, without being turned on by a person.
- The self-activating sprinkler system turns on when it detects smoke.
- The software has a self-activating update feature that runs at midnight.
- A self-activating alarm sounds automatically if the door is opened.
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