The ProTac HL 5-X USB is a 3,500 lumen tactical 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. They are the newest and brightest addition to the ProTac series. The output from the LED results in one of the brightest tactical lights available. The "sure grip rubber sleeve" and included lanyard ensures you'll never lose your grip.