The Reese Towpower LED breakaway switch is designed to automatically activate trailer Brakes upon separation of trailer from tow vehicle. For emergency use only and not to be used for trailer parking Brakes. The LED test light indicates power to the trailer Brakes. The durable reinforced nylon case and weld able metal tab has an ergonomic corrosion resistant design. Required by Law in some States. Reese is the market leader in automotive and recreational product solutions, engineered and designed to meet the demands for work and active lifestyles. Reese Towpower pioneered the technology that has set the standard for today's most advanced towing systems. We cater to the towing needs of everyone from recreation enthusiasts to heavy-duty agriculture users by manufacturing the largest selection of receiver hitches; ball mounts and hitch balls; trailer and hitch locks; couplers, jacks and winches; and electrical and lighting components that meet and exceed industry standards.