The AEX 30mm Combat Dot Sight is the perfect tactical complement to your airsoft gun. With infinite eye relief, red dot sights allow you to rapidly acquire and address your target, without losing your peripheral vision or suffering from “tunnel vision” that occurs with magnifying sights. The on/off dial allows you to select between either a red dot or a green dot. It features a robust aluminum, 30mm objective body with three intensity settings for either the red dot or the green dot. The low mount works very well with submachinguns while the high mount is designed to cowitness with a M4/M16 front triangle sight. The elevation and windage adjustments allow for ½ MOA per click at 100 yards. We highly suggest you sight in this dot sight at ranges greater than 50 yards. The scope uses LR44 lithium batteries which are included. Run time is approximately 60 hours of continuous usage on the strongest setting.