Helmet speaker set as seen in the actual photo. The two speakers attach firmly inside the helmet with adhesive velcro, which allows them to be easily removed and inserted. You can also slide the speakers between the helmet and the padding. Adjustable inline volume controls. Standard 3.5mm jack for MP3 players, Ipods, radios, and some cell phones. Quick release harness allows for removal of helment without having to remove the source equipment.