Primary Arms 3X Long Eye Relief Red Dot Magnifier Gen IV PA3XLERGENIV RED DOT MAGNIFIER: Place the magnifier behind your red dot or holographic reflex sight to instantly magnify the sight picture at 3x power. INTEGRATED DIOPTER: Provides a fast focus ability to keep the image clear. AZIMUTH AND ELEVATION ADJUSTMENTS: Keep the dot centered in your field of view. 1-YEAR WARRANTY: If a defect due to materials, workmanship, or normal wear and tear has caused your product to malfunction, Primary Arms will either repair or replace.