The ProTac HL series of flashlights from Stream light are the best flashlights on the market today Stream light's commitment to continuing to improve their product lineup and provide you with an exceptional value continues with the ProTac HL USB The ProTac HLUSB features a whopping 1,000 lumen high output for superior illumination The unit in considered dual fuel and runs on either two CR123A batteries or it can accept one Stream light rechargeable 18650 lithium battery (sold separately) Whether you need a reliable flashlight for work or play trust the Stream light ProTac HL-X to exceed your expectations