The Sena SURGE brings the innovation of Sena technologies to the timeless three-quarter motorcycle helmet. Designed with both comfort and advanced technology in mind, the SURGE allows riders to ride connected using our industry leading Mesh 2.0 intercom system.Features:DOT ApprovedOpen Mesh with 9 channelsGroup Mesh for private group connections3/4 helmet design with fully integrated Mesh Intercom communication systemMesh 2.0Bluetooth Version 5.2OTA (Over-The-Air) firmware update40MM HD Speakers21 hours of talk time WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov This warning is being provided to comply with the State of California's Proposition 65.