The Streamlight PolyTac X USB is a complete rechargeable system that includes Streamlight 18650 USB battery with an integrated USB charge port. Features MULTI-FUEL innovation that accepts Streamlight's 18650 USB battery or CR123A lithium batteries (sold separately). Features TEN-TAP programming that allows the choice of three programs: High super-bright light, Medium for bright light and longer run time, Low for extended run time High-impact, super-tough nylon polymer construction with Rocky Stipple texture for a sure grip.