Review on 1FT BolAAzuL Short Extension Power Cord - 2 Prong Male to Female Indoor/Outdoor Extension Plug - Black Exterior - Ideal for Christmas Lights by Michael Bressler

Perfect for converting a polarized plug (one thick and one thin) to a non-polarized plug (both thin) so you can string lights together. Some fairy lights, such as B. Christmas lights have polarized plugs, others do not. This can be very frustrating because you can't connect them together. This fixes the problem!