Ultra Safety Systems UFS-02 12 volt This is the same as the Senior model, but with no alarm function. This Automatic switch is a patented design and provides self cleaning with maximum immunity to clogging, sticking or pump burnout. Positive acting -no timer delays -no electronics that can fail. U. L. Listed. Impervious to all material commonly found in bilges. Extra long wire leads with sealed adhesive wall heat shrink wire connectors. Wiring instructions permanently stamped on the switch. Ignition protected. Highest quality construction. Switch components completely sealed against moisture. Contains no mercury. Exceeds U. S. Coast Guard standards. NOTE: SWITCH DOES NOT COME WITH A PUMP.