Sena Surge Open Mesh Helmet The Sena Surge Smart Helmet is a classically styled 3/4 helmet with integrated Mesh Bluetooth communication. The composite fiberglass shell and EPS lining provide protection and comfort, while the built-in Sena communication unit, HD speakers and microphone keep the you connected to music, directions and other riders. Open Mesh offers a simple, single push of a button to click-to-connect to the Mesh intercom network. With a simple push of the Mesh Intercom Button, the Surge Helmet will connect to any other Sena Mesh headset, allowing to talk to another rider up to 1 mile apart. The Open Mesh Intercom features the industrys first Mesh Intercom Channel System which allows users to switch between nine channels when operating in Open Mesh mode. For a private group conversation, the helmet also offers Group Mesh Intercom mode. Group Mesh supports a single, private group for up to 24 participants and the same range as Open Mesh. Features: A 3/4 style helmet with 3 shell sizes, integrated Bluetooth with discrete brow-mounted (boomless) microphone, and premium fiberglass construction Paint, graphics, and branding add to the premium feel Fiberglass composite construction built for impact protection and durability SM, Md-Lg, and Xl-2Xl shell breakdown 3/4 design with removable snap-on sun peak Two tone color schemes mix gloss and matte finishes Integrated comm unit, mic and HD speakers Includes helmet, helmet bag, Usb-C charging cable and quick-start guide DOT certified Removable and washable interior Double D-ring closure Bluetooth Specifications: Bluetooth 5.2 Intercom Mesh Intercom 3.0 Range 1 mile in open terrain Open Mesh: 6 channels Virtually unlimited number of participants Group Mesh 24 participants Advanced Noise Control Talk Time : 21 hours Charging Time: 2.5 hours 2 year warranty