Abstract: This device comprises an audible alarm member arranged to be sounded by spring operated clapper means which is normally held inoperative by temperature responsive devices all in a perforated housing suitable for installation in a room. The temperature responsive devices include a body of wax like material disposed between two cup shaped members of good heat conductive material and holding said members apart at all ordinary room temperatures. If the temperature surrounding the device is raised to a predetermined limit, as by a fire in the room, the wax body will soften or melt and this will permit the cup shaped members to be moved and cause the alarm to be sounded.