GEN3 Ultimate Sighting System (USS) 3-9X40mm scope with Red Micro Dot optic (DDAB). Micro Dot mounted directly to the scope body. Gives you all the benefits of a Mark III Tactical 3-9X magnified scope for intermediate/longer range targets and the advantage of a Micro Red Dot Reflex Optic for close range targets. There are five brightness settings for the Illuminated Reticle. The USS whole Ocular body functions as a large Magnification ring. There is also an adjustable reticle focus ring at the end of the ocular lens. Low Profile Elevation Turret with a Bullet Drop Compensator (BDC) calibrated for M193 55gr. FMJ Mil-Spec ammo. AR15/ M4 1? Scope Centerline height. New GEN3 Integrated Auto Locking Quick Release Mount, fits Weaver/ Picatinny/ MIL-STD 1913 type rails. Features a redesigned and more compact lever. Scope uses 1 each AA Battery (Included). DDAB Micro Dot uses 1 each CR2032 Battery (Included).