Riflescope, Laser Rangefinder and bullet-drop compensator combined for the single purpose of shooting with flawless precision. The wireless trigger pad straps to the fore-end of your rifle. When it's time to make the shot, just tap the button and the distance appears in the field of view. Install the included bullet-drop compensation turret that matches your caliber. When the range appears in the reticle, simply adjust it to the corresponding distance and hold dead on. Bushnell Tactical Bushnell Yardage Pro 4-12x40 Mil-Dot Riflescope 204124