The ProTac HL 5-X USB is a 3,500 lumen tactical flashlights that can use either two proprietary Streamlight 18650 USB rechargeable Li Ion batteries or four CR123A disposable batteries. The ProTac HL 5-X USB is a complete rechargeable system that comes with a charge cord and two 18650 button top batteries that feature integrated mirco-USB charge ports. It is the brightest addition to the ProTac series. It offers the latest in power LED technology and three different user selectable programs. The light will accept two Streamlight SL-B26 rechargeable batteries. The output from the C4 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.