Truglo opti-speed bdc crossbow scope 1-4x24mm illuminated red FEATURES:-Glass-etched reticle can be used w/ or w/out illumination-Enhanced crossbow BDC reticle compensates for bolt drop & provides accurate hold-over points from20-100 yds-Speed calibrated magnification system scales the reticle & target image to match bolt velocity (215-450fps)-Nitrogen gas-filled-Fully-coated lenses provide maximum brightness, clarity, & contrast-Adjustable rheostat brightness control-Durable leaf-spring click adjustments for windage & elevation-Wide field of view-Battery included Other Features: Glass etched reticle can be used without illumination, ehanced crossbow bdc reticle compensates for bolt drop and provides hold over points waterproof/fogproof/nitrogen gas filled, fully coated, 1/2 moa, weaver 30mm rings included, battery included (tg988c)