Zamp's Ear Cups with Speakers kit allows you to run one-way or two-way communication in your favorite helmet. Easy to install and set up, these Ear Cups with Speakers attach inside the helmet for easy installation and use.
Installation video:
 Ear Cups with Speakers Installation for RZ-70E, RL-70E, RZ-64C and RZ-65D Zamp Helmets (youtube.com)

• High Quality Speaker 28mm diameter
• 3.5mm Stereo Plug works for one-way receivers or two-way communication systems
• Velcro Pouches installed in Ear Cups for easy installation in helmet
• Small Footprint allows them to be mounted inside earcups