Surefire 618LM LED WeaponLight for Remington 870 &mdash; 2-Battery System, 2 Switches Max Output 200 Lumens Virtually indestructible LED and TIR lens produce brilliant beam optimized for close- to medium range applications SwitchesMomentary-on pressure pad, constant-on rocker ConstructionHigh-strength aerospace aluminum with Mil-Spec anodizing; impact-resistant polymer; coated, tempered window WeatherproofO-ring and gasket sealed Includes high-energy 123A batteries with 10-year shelf life