The ProTac HL 5-X is a 3,500 lumen tactical flashlight that can use either two proprietary Streamlight SL-B26 protected Li-Ion USB rechargeable battery packs or four CR123A disposable batteries. The ProTac HL 5-X comes packaged with four CR123A batteries. They are the newest and brightest addition to the ProTac series. They offer the latest in power LED technology and three different user selectable programs. 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.