The Fury IntellibBeam takes the automatic adjusting output of our previous P2X Fury with IntelliBeam Technology and increases the maximum output to an astounding 1,500* lumens. This versatile pocket-sized searchlight can be powered by either two 123A lithium batteries or a single economical 18650 lithium-ion rechargeable battery. IntelliBeam Technology automatically and seamlessly adjusts light output from 15 to 1,500* lumens depending on environmental conditions Virtually indestructible LED emitter regulated to maximize light output and runtime High-performance 3.6V 18650 lithium-ion rechargeable battery with MICRO-USB port (included) for ease of charging - no charging cradle needed Dual fuel light powered by either two 123A lithium batteries or a single 18650 lithium-ion rechargeable battery* Press or click tailcap switch to select IntelliBeam mode, return to off and press or click again within two seconds to select high-output only Mil-Spec hard anodized aluminum body, tempered window & O-ring seals make light rugged and durable *SF18650B battery required for 1,500 lumens output, up to 40 hours runtime, 25,200 candela and 315 meters beam distance