The Koss VC-20 In-Line Volume controller allows you to easily adjust the
volume level of your portable music player without having to adjust the player
itself! The gold-plated 3.5mm headphone jack simply plugs into your
portable satellite radio player or other music player, and your headphones plug
into the Koss In-Line volume control. A convenient pocket or belt clip
lets you position the control where it's most comfortable for you.
3.5mm gold-plated plug connects to portable audio player
3.5mm female headphone jack for plugging in headphones