This speed control box allows you to perfectly adjust the speed of the Hitachi magic wand to the level best for you. Previously, users were limited to two speeds. Now the possibilities are endless. It even works with other similarly limited plug-in vibrators. If that was not good enough, it also acts as a 2.5 foot extension cord, so you can dial up the perfect speed farther from the nearest electrical outlet. It is as simple as plugging your wand into the controller and you’re ready to get going. Features and Benefits: * No more settling for 2 speeds. Use the dial for an infinite number of available speeds. * The Var switch allows you to choose a particular speed. The Full switch generates full power between low-medium-high.