Detex MS-2049S Magnetic Switch for Mortise Installation Surface Mounted No. MS-2049F / MS-2049S These magnetic switches are designed primarily to serve as sensing devices to detect the opening of a door or window; to assure that a protected door is securely under surveillance; to serve as a trigger for a wallmounted Detex Exit Alarm; to signal that a door has been inadvertently left open; and to be used as a direct switch to set off many kinds of audio and visual alarms. Features: Tamper protection - mounting screws inaccessible when door closed. Components potted to protect against shock and moisture. Easy installation with concealed wiring and color coded leads. Surface mounted units are housed in a durable high impact ABS thermoplastic, a UL listed material used in the manufacture of telephones, auto bodies, etc. Wide range of alarm and signal applications. Minimizes false signals due to loosely closed doors. Switch rated for over one million operations under load. For use on steel, aluminum or wood doors and frames. Installs in ANSI-sized cut-out in both door edge and jamb.