Overview: Features a Cree XR-E P4 LED emitter Unique sliding zoomable focusable convex glass lens Zooms from throw to flood beam (variable beam spot) Powered by 1 x 18650 battery (Not include) Maximum voltage input: 4.2V 3-mode tail cap clicky switch Special glass reflector optics & lens 1~1.5 hours estimated total runtime (manufacturer rated) Circuit current output measured at LED: 800m A (manufacturer rated) Specification: Dimensions: 4.65 in x 1.18 in x 1.18 in Weight: 4.09