iPROTEC O2 BEAM Kit, White:400 lumen4 light modes:100 percent: 400 lumen (500m, 240 minutes)50 percent: 200 lumen (219m, 480 minutes)10 percent: 40 lumen (46m, 900 minutes)Strobe: 400 lumen (500m, 4320 minutes)Universal long gun mount accommodates barrel and scope diameters from 20mm to 32.5mmTactical edgeConvex lens4x adjustable beamAnodized aircraft-grade aluminumWater and impact-resistantInstant strobe side buttonMount includes accessory rail system for mounting additional accessories (18mm x 24mm)Standard end capUses steady and momentary activationUniversal mountDual-mode pressure switch3 AAA batteries includedLength: 6.25"Diameter: head: 2.125"/barrel: 1.5"U.S. Patent: D657, 840 and other international patents pending1 year manufacturer's warranty