Overview: Model: ROMISEN RC-K4 Powered by 1 x 18650, or 2 x 3.0V~3.6V CR123A, or 3 x 1.2V/1.5V AAA batteries (AAA battery case included, batteries sold separately) Power input: 3.0V~8.4 V Features a Cree XR-E LED emitter Tailcap clicky switch Glass lens with aluminum