PCI Race Radios Trax Helmet Wiring Kit With Race Speakers and Ear Jack The Trax Helmet Wiring Kit, fitted with HFI Speakers, offers exceptional sound performance and dependability, allowing you to focus on what's ahead. Wires to virtually any helmet. Features: Easy, do-it-yourself kit! 3.5mm ear jack Trax 300ohm HFI Speakers 150 ohm low gain microphone Water-resistant connector 5 conductor grey plug