The SIERRA3BDX 2.5-8x32mm is a compact and lightweight riflescope designed for ultra-lightweight rifle, shotgun muzzleloader, and crossbow configurations. With the power of the included BDX technology, it provides your exact holdover dot location on targets when coupled with a BDX capable KILO rangefinder. Featuring exceptional SpectraCoat™ lenses, LevelPlex™ digital anti-cant, and KinETHIC™ kinetic energy transfer indicator, the SIERRA3BDX 2.5-8x32mm is incredibly simple to use. Range a target, put the holdover dot on target, pull the trigger, impact.Product Features:Integrated BDX - Integrated BDX™ Ballistic Data Xchange. A rangefinder and riflescope system that uses ballistics, environmental conditions and Bluetooth® to illuminate the exact holdover dot.Digital Focal Plane - combines Second Focal Plane stadias, with an OLED illuminated ballistic holdover dot that automatically scales with zoom to subtend on target at any magnification levelMotion Activated Illumination - MOTAC powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced battery lifeSpectraCoat Lenses - highly efficient, ultra-wide broadband, anti-reflection lens coatings reduce surface reflections to extremely low levels across the entire visible spectrum providing superior light transmissionDurable Construction - Dependable waterproof