Abstract: A multiple function alarm (10) for the security of an individual within a preselected area, the alarm (10) having substantially all its electrical components mounted to a board (12), includes a switch (14) for selecting the function the alarm is to perform; a smoke detector (16) for optically detecting the presence of smoke including a light source (72) for generating light and a light sensor (73) both mounted on the board (12); intrusion detector (15) for detecting an unauthorized intrusion into the selected area, a visual alarm (18) and audio alarm (19) for communicating to the individual the presence of a potential security threat; and a plate assembly (13) for housing switch (14), the intrusion detector (15) and the alarms (18, 19) in operative association with the electrical components mounted to the board (12).