The Mepro MMX4 micro is a compact, lightweight magnifier that will extend your effective range of your red dot or 1x reflex sight. Reducing the footprint, saving rail space and weight on your firearm. Elevation and windage dials provide precise FOV line of sight alignment. A wide FOV enables rapid target acquisition with both eyes open which is ideal where agility. The Mepro MMX4 micro magnifier attaches to any MIL-STD-1913 rail directly behind your optic. When not in use the Mepro MMX4 can be flipped out of the way by depressing a push button. No batteries needed. Includes two rubber covers and side flip mount.