The automatic drl control box relieves you from searching incommodiously the positive terminal. Particularly, since many vehicle manufacturers do not supply anymore a bordcomputer error free positive ignition terminal in the engine compartment. Easy connection to the vehicles battery. The control box recognises when the engine operates and turns on automatically the daytime running lights. Only connect to the position light and ready. As soon as the low beam is switsed on, the drl dim. about 22 seconds after turning off the engine the drl go out as well (ComingHome function).