LENS : Use of an optic design to provide a balanced ratio of beam width and distance to safely illuminate you and the path ahead. CONSTANT BRIGHT TECH : Maintains consistent brightness throughout specified run-time. INTEGRATED USB PLUG : Designed to be exposed to the elements, 100% waterproof. THERMAL MANAGEMENT : Automatically regulates the light output for optimum performance. BIKE ATTACHMENT : Two removable silicone straps for bars 22-28mm & 29-35mm (tool-less attachment). MATERIALS : Polycarbonate housing and PMMA Lens. Hard-anodised aluminium fascia. UV-Resistant silicone. BATTERY : USB Rechargeable Lithium Polymer ACCESSORIES INCLUDED: Helmet mount, 2x interchangeable straps for front light, USB charge cable.