A smoke alarm system having a base and a body. The base is mounted onto and electrically connected to an unswitched electrical box. The body contains conventional smoke alarm circuitry. The base contains a threaded female socket similar to a standard light bulb socket. The body contains a corresponding male threaded connector similar to that on a standard light bulb. The body is thus able to be electrically connected to as well as physically mounted to the base by simply screwing the male threaded connector into the female threaded socket in the same manner as a light bulb is screwed into a light socket. The base is installed on the ceiling with its wires extending into the unswitched electrical box. A metal ring on the bottom shoulder of the base is connected to the smoke alarm interconnect system. On top of the body are two metal spring-loaded tabs which are connected within the smoke alarm to its interconnect system. As the male portion of the unit is screwed into place these metal tabs make connection with the metal shoulder on the female portion of the unit completing the interconnect circuit. A light bulb changing device on a handle may be used to remove and reinstall the units while standing on the floor.
