HOTSYSTEM DC12V 20A Round Rocker Toggle Switch ON-Off Control SPST LED Illuminated 3Pin Triangle Plug for Car Motorcycle Boat Marine Truck Trailer Auto and More (Green,5-Pack) Designed to connect and disconnect an DC12V 20A electrical circuit at will,SPST:ON-OFF control. LED lamp will be lighted up when the switch is turned on. Fits into a 3/4" hole.And it comes with a keyhole slot to prevent unwanted rotation. Coppery pin is connected to the battery negative pole,the next pin is connected to the battery positive pole,the last one is connected to the equipment positive pole. Suitable for almost any motorized vehicle such as car,truck,boat,atv,motorbike etc.Can also use these on water dispenser, running machine,electromobile and other household appliances modification.