DETAILS: 6-36 VOLT, 500A INTERMITTENT, 310A CONTINUOUS, 3-TERMINAL, 4-POSITION OFF-ON(2)-ON(BOTH)-ON(1), WEATHER SEALED, MARINE CERTIFIED. A SELECTOR SWITCH ALLOWS USE OF THE FIRST BATTERY, THE SECOND BATTERY, OR BOTH BATTERIES SIMULTANEOUSLY. THESE SWITCHES COMBINE THE FUNCTIONS OF BATTERY SELECTOR AND MASTER DISCONNECT SWITCHES. HEAVY-DUTY CONSTRUCTION VAPORPROOF, WEATHER-, DUST- AND CORROSION-RESISTANT. CAN BE SURFACE MOUNTED, OR INSTALLED THROUGH A 3 5/16" DIAMETER HOLE IN THE PANEL