SureFire LED WeaponLight for Mossberg 590, or 500 w/ 7 &frac34;" Forend Tube 100 Lumens of Output for 1.4 Hours Virtually indestructible LED and TIR lens produce brilliant beam optimized for close- to medium range applications SwitchesMomentary-on pressure pad, constant-on rocker, system-disable rocker ConstructionHigh-strength aerospace aluminum with Mil-Spec anodizing; impact-resistant polymer; coated, tempered window Includes high-energy 123A battery with 10-year shelf life