The flat's resident was awakened by a smoke alarm. He also found a hidden camera in a smoke alarm. The hotel was also not equipped with automatic fire and smoke alarm systems. In some cases, this may set off a smoke alarm. In the 1970s, , Pittway and General Electric were the dominant consumer smoke alarm manufacturers. The 10-year-lithium-battery-powered smoke alarm was introduced in 1995. Previously, a smoke alarm was shown to be missing batteries, and thus was inoperable. The smoke alarm alerts Buffy and her mom to Dawn's little fire and departure.