<b>Some customer feedback:"The sights are blurry,and it shows double images."Please don't worry,It just need 3-5 minutes to preheat when you first time to use it.(Just open and let it stay for 3-5 minutes).Then it will show clearly.If it still blurry,please contact us before you low rating,we will try our best to help you out.<p>This Feyachi Reflex Sight is like having 4 different sights in one! A 33mm sighting system allows for fast target acquisition, and the open design allows the shooter to stay aware of the surroundings. The dot system is adjustable for red or green and any one of four different styles of reticle. Like getting 4 different sights in one! Lightweight, yet tough and with the rail attachment system it securely mounts to your rifle or shotgun and will last, do not let the price fool you, this is a well made reflex sight.</b> <p> Specification: <p> -Weight:4.1oz/115g <p> -Objective aperture: 33mm <p> -Field o.V.: 15.8@ 100m <p> -1 Click: 1moa <p> -Length: 82mm <p> -Package size: 4.5 x 3 x 2.8 inch <p> Package Includes: <p> -1 x 4 Reticles Reflex Sight <p> -1 x Rubber lens Cap Cover <p> -1 x Cleaning Cloth <p> -1 x CR 2032 Battery <p> -2 x Wrenches <p>