Outdoor Tech OT0042 Wired Chips - Universal Helmet Audio System (Black) Universal fit with almost any helmet that has an audio-ready liner.Connectivity Technology: Wired Oversized, two-button interface controls volume, track, play/pause, and telephone calls 40 mm drivers for outstanding sound and ear-crushing volume No battery means no charging and no worrying about going silent Sweat-resistant and designed for use in extreme cold (-20 Degree C/-4 Degree F)