The RT4-01 Red Dot Sight With 4 Different Reticles with aircraft grade aluminum body withstand constant heavy recoil. This Red Dot Sight Is Fog proof and has a shock-resistant housing with weather resistant seals coated lens provides superior light transmission, resolution and scratch resistance. Single-illuminated (red) reticle with adjustable rheostat for brightness control. Integrated picatinny/weaver mounting system. Unlimited eye relief for quick target acquisition. Includes protective lens cover.