Yamaha - Siren Marine Magnetic Reed Switch - SM-ACC-REED - 6X8-85B41-00-00 Features: Magnetic reed switches are used to detect unauthorized entry into the main cabin through a door or external hatch Reed switches can monitor multiple entry points, providing secure protection against theft. In the event of unauthorized entry, the switches will trigger an entry alert Screw mount and adhesive mount included Grounds directly to security input Compatible with the Siren 3 pro and Plus only M.P.N: SM-ACC-REED 6X8-85B41-00-00 - Switch, Magnetic Reed