EdisonBright Nitecore TM16 4000 Lumen CREE LED Tiny Monster Flashlight, D4 smart charger, 4 X Nitecore NL189 18650 3400mAh with AA alkaline batteries sampler bundle Max output of 4000 Lumen using 4 X CREE XM-L2 U2 Powered by 4 X 18650 batteries max runtime of up to 520 hours Advanced Temperature Regulation (ATR) technology This bundle includes D4 smart charger, 4 X Nitecore NL189 18650 3400mAh Li-ion batteries with EdisonBright AA alkaline batteries sampler