Sidewinder Compact II features C4 LED technology proucing 55 Lumens on High. Run time of 6 Hours on High. 47 Lumens on AA batteries. Accepts multiple power sources :One CR123A, One AALithium or one AA Alkaline battery. Also features Red, Blue and IR LED's. 4 levels of of increasing output intensitiesplus a strobe function. Articulating 185degree head Includes CR123A battery, helmet mount and headstrap