Trijicon style red dot sight Magnification : 1x Bullet Drop Compensator : No Length (In) : 45mm Illumination Source LED Reticle Pattern : 3.25 MOA Dot Day Reticle Color : Red Night Reticle Color : Red Bindon Aiming Concept : No Adjustment @ 100 yards (clicks/in) : 1.0 Housing Material : Forged Aluminum Batteries 3V Lithium Battery （included） Package including: 1.RMR with Box 2.Rail mount 3.Glock Mount （Mount Screws） 4.Pistol Mount for 1911 Novak Cut - .248 （Sealing Plate，Mount Screws，Socket Screws，Allen Wrench） Attention: Please install the glock mount when you want mount the red dot sight in your glock gun If the red dot sight is not very bright, it is suggested that you can replace the battery. And the RMR Style Red Dot Sight is most fit airsoft. The “-” button weaken the brightness of light. The “+” button increase the brightness of light.