Abstract: A security system for a home to actuate a signal upon the opening of a movable closure member (12) mounted within a fixed framing member (14). The security system includes a switch assembly (20) having a cylindrical housing (24), a magnetic switch element (26) removably received within the housing (24), and an outer removable cap (28) fitting over the open end of the housing (24) to permit selective insertion and removal of the switch element (26). When the housing (24) is positioned within a bore (21) of the fixed framing member (14), the cap is the only exposed visible portion of the switch assembly (20) and may be provided in a variety of preselected colors in accordance with the color of the framing member (14) while the remainder of the switch assembly (20) may be of a single base color.