motion detector

Noun

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

Translations

 * Chinese:
 * Mandarin: 動作感應器
 * Finnish:
 * German:
 * Hungarian:
 * Irish: brathadóir gluaiseachta
 * Italian: sensore di movimento
 * Russian: дете́ктор движе́ния