The ProTac 2L-X USB is a 500 lumen EDC light that is a rechargeable system. It comes with Streamlight's new SL-B26 (18650) USB battery with integrated USB charging port. Multi-battery versatility means the user can always use primary disposable cells to power the light if the rechargeable cell is out of power and a charging source is not available. It features a tactical tail cap switch for momentary or constant on operation, three different user selectable programs and a pocket clip for convenience.