Ultra Safety Systems 12 Volt Ultimate Senior Pumpswitch Ignition protected. Marine UL listed. Positive acting - no timer delays - no electronics. Impervious to all materials found in bilges. Switch components sealed against moisture. Patented design provides maximum immunity to clogging, sticking or Wiring instructions engraved on the switch. Exceeds U. S. Coast Guard standards. Includes Alarm Sensor (Alarm not included).