Motion detector

/mˈəʊʃən dɪtˈɛktə/

/mˈoʊʃən dɪtˈɛktɚ/

Motion detector

a device that detects the presence of movement within a specific area and can trigger an alarm or other action as a result

Examples

1. There are no like motion detectors in front of the elevators.

2. We work with organizations that use advanced solar power, sort of motion detector lighting.

3. And you walk into his office, and the doors open by motion detector.

4. Like the motion detector, this ALARM was not connected to the Outside World but did the thieves know that, as well.