The Streamlight ProTac HL USB is a new tactical rechargeable flashlight with three different power options Use the included lithium-ion rechargeable battery, or use two CR123 non-rechargeable lithium batteries OR a 18650 lithium-ion rechargeable battery The ProTac HL USB produces 850 lumens in high with a 15 hour run time It has a convenient USB charge port that you can use to recharge the included lithium-ion battery