1.Feature: This 12 volt push start button is momentary SPST design. The momentary push button switch with a black neoprene cover can prevent water, moisture and dirt.2.Size: The height of the starter switch is 2.44 inch(without cover), the diameter of the starter button is 1.1 inch. The reqiured mounting hole of the horn button switch is 5/8 inch(0.625 inch).3.Voltage: The rating of this waterproof engine start button is 50A 12v.4.Function: The start button is momentary ON/OFF push button switch, normally stay at the OFF position; press, the switch will be turned to ON position; release, the switch will return to the OFF position.5.Waterproof, Weatherproof & Dustproof: the cover of the button enables the push button starter switch to be used in extreme environment, it is widely used as the horn, ignition and start switch for car, truck, golf cart, rv, atv, utv, lawn tractor, marine, boat, etc.Momentary Push Button Switch This starter button is momentary design, SPST 2 pin normal open