Ultra Pumpswitch Mini 24 amp. 4" high. 1-3/4" diameter. 12 volts. 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 pump burnout. Wiring instructions engraved on the switch. Exceeds U. S. Coast Guard standards.