Introducing the Ravin Crossbows R189: an innovative marriage between two leaders in crossbow precision. Engineered exclusively for Ravin by Garmin, the integrated Xero X1i Crossbow Scope has been skillfully optimized for your individual Ravin crossbow model. The calibration of the Xero X1i scope is swift, effortless, and automatic, ensuring your alignment is perfect. After mounting the scope, choose your Ravin model, then sight-in at 20 yards; the precise digital aimpoints have been pre-calibrated for you. The advanced processor of the Garmin Xero X1i takes over from there. Experience a blend of precision unparalleled in the field. This premium upgrade enhances your lethal precision and makes a rangefinder redundant, sparing you unnecessary weight and equipment. The X1i is preloaded with ballistics for all Ravin models, except the R18, including R9/R10/R15/R20/R26/R29/R5X/R10X/R26X/R29X/R500.