The BDX Sierra3 riflescope provides the hunter an illuminated auto-holdover dot on targets. It features exceptional SpectraCoat lenses, LevelPlex digital anti-cant, and KinETHIC kinetic energy transfer indicator. The onboard Applied Ballistics Ultralite calculator sends ballistic drop data via Bluetooth directly to the SIERRA3BDX's BDX-R1 reticle, providing an illuminated holdover dot and wind hold. Download the free BDX App for iOS or Android to setup ballistic profiles. This model has a 3.5-10x magnification with a 42mm objective and black finish.