White cotton has a 2-prong male plug. Soft black polypropylene has a 3-prong male plug. Both can attach up to three items at female end.
The Helix Extension Cord makes it even easier to hang one or more of the Helix Lights. Plug one end into a power strip and one to three lamps can be turned on with the power strip's single switch. There is no switch on the extension cord. UL certified.