A detector is composed of a body and an electromagnetic sensor and determines movement of a mouth by detecting an electromagnetic field such as infrared light or visible light radiated when the mouth moves.COPYRIGHT KIPO 2014한 몸체와 전자파 센서로 구성되는바, 입을 놀릴 때 방사(radiate)되는 적외선(infrared light)이나 가시광선(visible light)과 같은 전자기파(Electromagnetic field)을 탐지함으로써 입을 놀리는 것을 판별하는 탐지기.