The World's First Smart LED Flashlight with PC programmable features built in. Utilizes ultra bright U.S.A. made Cree?« LED emitters. Unlimited mode settings including brightness level, strobe and S.O.S., available for various lighting applications. No ordinary flashlight is comparable. Wt: 1.96 oz. (AA), 2.52 oz. (2AA), 4.76 oz. (3AAA), 4.61 oz. (18650).