Overview: Circuitry designed for Cree, SSC, & emitters with similar power specs Manufacturer rated maximum input voltage: 4.5V (2.6V cut-off) Manufacturer rated current output: 1000m A (when input is around 1000m A) Can be powered by a single 3.7V lithium battery (such as CR123A, 14500, 10440, etc) or two to three 1.2V / 1.5V batteries Plug & play state circuitry offers 5-modes as soon as you install this circuit board into your light Works with both clicky siwtches & twisty switches Mode cycle: Hi 100% gt; Mid 35% gt; Lo 20% gt; Strobe gt; SOSSpecification: Weight Approx:1.3g Size Approx:1.7 x 0.3 x 5