noun
residential smoke detector; smoke alarm
A fire alarm device designed for home use, as opposed to commercial or industrial settings. Often required by law in Japanese residences.
See also: 火災警報器 (かさいけいほうき)
住宅用火災警報器は寝室と階段の上に設置が義務付けられています。
Residential smoke detectors are required to be installed in bedrooms and at the top of stairs.
この住宅用火災警報器は電池式で、簡単に取り付けられます。
This residential smoke alarm is battery-operated and easy to install.
Compound of 住宅用 (residential) + 火災 (fire) + 警報器 (alarm device).