The Koss VC-20 Volume Control allows easy sound level adjustments without having to adjust using your music player itself. It can be used for any music player or satellite radio player. This Koss Volume Control has a 3.5mm gold connector that can connect to most portable audio players. The headphones can be plugged in to the 3.5 mm female headphone jack. It includes a belt clip for positioning the inline headphones volume control according to your convenience. Compact and featuring a slim design, the Koss VC-20 Volume Control helps you enjoy your favorite music on the go.