Wired Magnetic REED SwitchMagnetic reed switches are used to report unauthorized entry into a main cabin through a door or external hatch. Reed switches can be connected in series to monitor multiple entry points, providing secure protection against theft. In the event of unauthorized entry, the switches will trigger an entry alert to the boat owner, and can also be configured to sound an audible alarm on the boat.Specifications:Dimensions: 1x1in (2-part body, 0.5x1in each) 12in (wire)Screw mount and adhesive mount includedGrounds directly to security inputWorks with MTC and Siren 3 Pro