In-Helmet Speakers with 3.5mm Plug - Stereo / StandardIn Helmet Speakers with 3. 5mm Plug provides a music experience suitable for intense activities like high speed turns or double jumps while dirt biking or street biking. Rugged Radios offer Clear Hear Speakers or Alpha Audio with standard 3. 5mm jack options for the user. Key features include slim line speakers that fit comfortably in your helmet, easy install velcro mounting, industry standard 3. 5mm jack, a tough polyurethane cable for durability,