出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/13 21:14 UTC 版)
A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible and/or visual alarm from the detector itself.