About this item Make sure this fits by entering your model number. Exquisite Technology: adopts high transmittance lens and the latest design technology to ensure a clear vision, and shooting the aim without any shaking. Superior Material:equipped with shockproof and weatherproof materials, as well as metal frame, which will guarantee the sight can be used in severe environment. Easy to Use: the reticle color can be changed into red or green dot with one switch. 10 levels of brightness settings Battery Features: Powered by two AA batteries to give a longer range time. --Easy to set up. Versatility: The sight is suitable for any 20mm tactical rails