The perfect addition to any crossbow. It's 1/2" adjustments at 20 yards along with speed adjustments from 275 to 410 fps make this scope a breeze to set up and shoot with any crossbow. This multi-reticle scope has red or green illuminated reticles that deliver positive acquisition. Adjustable rheostat provides custom light intensity. Multicoated lenses and 30mm tube increase low-light performance. Runs on one CR-2032 battery. Rings not included.