This complete off-road flex boom helmet kit features Rugged Radios' new Dura-Link Sealed Connector, Clear Hear speakers and dynamic noise canceling mic for best audio performance, and a 3.5mm input port for music cable or earbuds. The Dura-Link Seal, featured on all Rugged helmet kits, seals the connection between the intercom cable and helmet kit plug. The Dura-Link Seal protects the connection contacts from water, mud, and dirt which can affect audio performance, and works with current Rugged off-road intercom cables.