Features a Cree XR-E P4 LED emitter - Bright: 200lm - Unique sliding zoomable focusable convex Acrylic lens - Zooms from throw to flood beam (variable beam spot) - Powered by 1 x 18650 battery (sold separately) - Maximum voltage input: 4.2V - 3-mode tail cap clicky switch - Special glass reflector optics and lens - 1~1.5 hours estimated total runtime (manufacturer rated) - Circuit current output measured at LED: 800mA (manufacturer rated) . *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)