The HS403C is a 20mm micro optical sight designed for rifle and carbine applications. Features include Solar Failsafe, 12 brightness settings, Holosun's Green Super LED with up to 50k hour battery life, and 2 MOA Dot. The HM3X is an Aluminum bodied 3X magnifier that includes a quick release, ambidextrous, flip-to-side mount with Absolute and Lower 1/3 Co-witness mounting solutions. Additional features include 2.75" of eye relief, IP67 certified water resistance, with windage and elevation adjustment for precision zeroing.Features :2 MOA Dot ReticleUp to 50,000 Hours Battery Life (Setting 6)12 Brightness Setting: 10 DL & 2 NV CompatibleConvenient Tray Battery CompartmentParallax-free & Unlimited Eye ReliefFlip-to-the-side DesignOutstanding Specification & ClarityIP67 Waterproof