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voice-activated

adjective
 
 
/ˈvɔɪsˌæk.tɪ.veɪ.tɪd/ US  /-t̬ɪd/

Definition

Voice-activated machines, systems, etc. work when you speak instructions to them: The phone has voice-activated dialling.Computer concepts
(Definition of voice-activated adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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