Manufacturer is Cole-Hersee, Boston Massachusetts USA. Marine UL listed 707B battery switch product with Yacht Safety Bureau—so originally made for boats. Could be used for auto, truck or industrial use with one or two batteries. Brass terminals underneath the housing. Rated for 6, 12, 24 or 36 volts and 175 amps continuous, 325 amps intermittent use. Allows for use of #1 battery, #2 battery, both #1&2 batteries or off to disconnect both batteries. Switch housing is 5 1/2 inches in diameter. Emails will NOT be responded to, phone calls, chat or text only please. Don 5O9-308- two895.