Tekonsha 7 Way Trailer Wire Emulator w/ LED Display. 7-Way Blade Tester and Trailer Emulator Features LED display Used to properly install and set-up the brake control when a trailer is not readily available Uses a built-in load module that will simulate electric magnet brakes on a trailer Package Contents: Tekonsha 7 Way Trailer Wire Emulator With LED Display Tekonsha 6562: 7 Way Trailer Wire Emulator w/ LED Display