1,Used for all sorts of DC motor reversing applications such as camper trailer jacks, RV Power Jack, winch controls for in/out operation, door open closed, liftgate up/down..so many uses. 2,Very handy item to have around the shop if you are a DYI type. 3,This unit has a rubber weather seal on underside of mounting lip for added weather resistance. 4, Unit is rated for 20a (30a peak) at 12V DC and 10a at 24V DC, Fit's standard 0.83 x 1.46 inch hole (about 21mm x 37mm) 5,Ships one switch with 4pcs 14 gauge wires just in case you don't have the 250 female terminals.