Features:Car, ship modification general: such as for cars, buses, trailers, trucks, sweepers, sprinklers, ships, yachts, etc.Modify the device that controls all electrical equipment in the cab to turn on or off.Output circuit for protection, overload for protection, reverse polarity for protection, multiple for protection, use safety.This switch is a momentary auto-reset action that resets back off when released. This polar reverse switch replaces most RV/trailer power jack wheels.Number of needles: 4 needles, action: momentary lock. Contact Type: DPDT.Package Includes:1x Rocker SwitchSpecifications:Material:PlasticColor:BlackMounting hole size:Approx.3.74x2.1cm/1.47x0.82inchnote:1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Thanks for your understandings.