<b>HOW TO ADJUST FPS? </b> <br><br> Point at its center using the 20 yard aiming point on the reticle. If the point of impact is higher than the point of aim, turn the FPS speed selector dial to a slightly lower number. <br><br> If the point of impact is lower than the point of aim, turn the FPS speed selector dial to a slightly higher number.<br><br> Once the point of impact is the same as the point of aim at 20 yards the scope is calibrated for your crossbow speed. It is not necessary to adjust the FPS selection dial for other distances.<br><br> If the FPS selection dial is changed you will need to recalibrate your crossbow using this process.FOR ANY QUESTION ABOUT FPS,PLEASE CONTACT THE CUSTOMER SERVICE.<br><br> <br><br> <b>Features:</b><br><br> The wide angle image is bright and crisp, and the long eye relief eye bell design allows the scope to quickly come up to the eye. <br><br> The new scope is adjustable for speeds between 300 fps and 425 fps<br><br> This is loaded with features including a new updated reticle design, a 30mm tube, red/green illumination and a multi-coated lens for exceptional clarity.<br><br> With speed adjustment dial, are the perfect upgrade scope for any crossbow.<br><br><br><br> <b>Description:</b><br><br>Magnification Power: 1.5-5x<br><br> Objective Diameter: 32mm/1.26inch<br><br> Tube Diameter: 30mm/1.18inch<br><br> Exit Pupil Diameter: 6.4-23.3mm/0.25-0.92inch<br><br> Length: 210mm/8.27inch<br><br> Illuminated: Red and Green<br><br> Reticle: Ballistic Retic<br><br> Parallax: Parallax Free<br><br> Material: Aluminum<br><br> Lens Coating: Fully Multi-Coated<br><br> Adjustment Click Value:1/2 MOA <br><br> Battery:CR2032 (included)<br><br> Nitrogen: Full filled Nitrogen<br><br> Weight:15.8 Oz<br><br> Waterproof: 50cm/19.7inch<br><br>Turret Height:Low <br><br> <b>Package includes:</b><br><br>crossbow scope<br><br> 2 scope rings<br><br>2 Flip-open Lens Caps<br><br> 2 CR2032 batteries<br><br>cleaning cloth<br><br>wrench<br><br>Manual