When a row of electric wires plug together, it’s complicated for us to figure out which wire is exactly the one that we want to pull out. Especially the ones under the desk, in the corner or other places that are too dark to see. Moreover, when pulling out plugs from the extension cords, we always have to place one hand on the receptacle and use the other pulling out plugs. This is called “Plug Label”, and it’s designed to solve problems and bring convenience to people.