Callfire@3-in-1combo Set 2.5-10x40 Scope Red Do Sight Magnification: 2.5-10x 5 levels brightness green and red illumination system Excellent for rapid-shooting and moving target Right and up screws are for the adjustment of windage and elevation. Loosen back two screws before adjustment and tighten after to lock in settings 2.5-10x40 Scope With Green Laser, Red Dot Reflex Sight Combo