Vktech Super Bright 2000 Lumen CREE XM-L T6 LED Zoomable Flashlight Torch Light Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent Battery type: 2 x 18650 3.7v Battery (Batteries Not Included) Zoom In/Out to adjust its Focus: x1, x250, x500, x1000, x2000