Last Updated：2025/11/28

A device used in security systems that can alert the user of the presence of a moving object.

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motion detector

Source Word

motion detector

A device used in security systems that can alert the user of the presence of a moving object.

Japanese Meaning

動体検知器：セキュリティシステムで使用され、動く物体の存在を感知してユーザーに警告を発する装置

The motion detector in the hallway triggered the alarm late at night.

廊下の動体検知センサーが夜遅くに警報を鳴らした。

Sense（1）

A device used in security systems that can alert the user of the presence of a moving object.

motion detectors

（ plural ）