### Question
How is the "smoke detector" defined?


### Answer
The term **smoke detector** is defined in *15 U.S.C. § 2225* as follows -

> an alarm that is designed to respond to the presence of visible or invisible particles of combustion

#### Citation:
  - *15 U.S.C. § 2225*
  - Heading: **CHAPTER 49-FIRE PREVENTION AND CONTROL**

