Nine dots, calibrated at 10-yard increments from 20 to 100, give you supreme accuracy in the PSE HDV-425 1.5-5×32 Crossbow Scope. Made for variable speeds from 250- to 425-fps. Just set the speed dial to the desired setting and tighten the screw to lock in the speed. Five light-intensity settings with a green or red dot illuminated dot besides the black dot. Uses a second focal plane lens with multiple coatings for waterproof, shockproof and fogproof qualities and is high definition. High definition for clarity and maximum brightness. The 7/8 mounting rails fit Picatinny rails. Etched glass ballistic reticle. Precise 1/2-MOA clicks.