Red dot sight with a wide field of view focusing screen. Puts a red dot on the screen of the sight (not on the actual target). LED beam is adjustable for windage and elevation with a simple twist of the adjustment knobs. A great upgrade or replacement for your current sights for anything that is grooved with the standard 3/8" dovetail base. Fits airguns, paintball guns, crossbows and .22 rifles. Uses 3V type 2023 coin style lithium batteries (included).