Material: Aluminum White-light and Strobe Output Ver. CREE Q5 LED generates 200 lumens of blinding white light and continues producing-level light for more than about 30 min Tactically switching:click-on / off tailcap The second generation of pressure activated tape switch Securely attaches to any Mil-Spec Picatinny rail in seconds Powered by 1*CR123A(3.0V)Battery [Use 16340(3.7V) battey may cause damage of circuit] (Not Included)