Meet the Feyachi 1x33mm Reflex Sight: a gun scope sight with red and green settings and 5 different levels of brightness. The Reflex sight has an aluminum body and waterproof/shockproof design. You get 4 different illuminated reticle patterns.
You get a sight window of 33 x 24mm. The device is made for Picatinny/Weaver rails.
[where to get it]