Features a Cree XR-E P4 WC LED emitter - Unique sliding zoomable focusable convex glass lens - Zooms from throw 1X to flood 2000X beam (variable beam spot) - Powered by 3*AAA 1.2V/1.5V batteries (4.5V maximum total voltage input) - 3-mode tail cap clicky switch: Mid > Hi > SOS - Special glass reflector optics and lens - Circuit current output: 800mA (this information is for those who wants to mod the light) - 3~5 hours total runtime (manufacturer rated) - Regulated driver circuitry . *When using the throw 1X mode the beam spot looks a bit square-ish because the Cree emitter is a squared chip. This is a designed feature not a defect. The flood 2000X mode features a typical looking rounded beam spot (see beam shots).