Designed to work with the Stilo Trophy Intercom system, the noise cancelling earmuffs dramatically reduces noise levels allowing the driver and co-driver to easily communicate and hear each other in a noisy rally car while transiting on road sections and on a recce. The metal flexible boom guarantees the microphone is never far from your mouth and is rigid to not move even on the roughest of road surfaces. The headset design allows for easier storage by allowing the earcups to be folded up inside the headband. * Please note this headset will not work with WRC 03, WRC 9V, DG-10, or DG-30 Intercoms.