Highlights: Model: 5AQ2 Features a Cree XR-E Q2 LED emitter Built-in driver module Accepts 3.6V~12V input Fits into Ultrafire WF-502B & similarly designed flashlights 26.5mm diameter Comes with two sets of differently sized support springs for maximum compatability (one preinstalled in the center, another is a removable larger spring around the bottom) Color temperature: 4000~4300 K Single mode regulated circuitry Specification: Dimensions (cm): 2.6 x 2.6 x 3.6 Weight (Kg): 0.0193 Package Contents:1 x Flashlight