Headset and Helmet Kit Extension Cable with Volume Control can extend your headset or helmet cables and adjust the volume with an inline knob. Each person in the vehicle can independently modify their volume. Particularly useful for moto riders, this extension allows volume adjustment without accessing tucked away phones or radios. The volume knob attenuates incoming volume but doesn't increase it. To increase volume, adjust the device volume and then fine-tune with the inline knob. Features RF blocking, mono intercom RUGGED wired and stereo intercom STX wired options. This coil cord can stretch from 28in to 6'. Compatible with all Rugged, PCI Race Radios, Avcomm, RacerX, and other intercoms.