Smoke detector

摘要

A smoke detector is battery operated and may employ an ionization chamber and/or an infrared detector. When the alarm circuit is actuated due to the presence of smoke levels above a predetermined value being sensed by the detector, the alarm is actuated and each of the built in lights is illuminated. An auxilliary light energizeable by said detector is adapted to disengage one of said lights electrically and to be energized at the same time the other of said lights is energized.