Rifle Scope 1x30mm Red Dot Sight with 20mm/11mm Weaver Picatinny Mount Rails, Five Brightness Settings Reflex Sight for Hunting Spotting Aiming Positioning Detachable Weaver Rail Mount has 11mm and 20mm Two Mode to Attach. 5 Brightness Setting Inllumination,Red Dot and Green Dot two Mode. 60@ 100yds Field of View for Unlimited Eye Relief. Black Anodized Aluminum Construction Screw Off the Cover to Use a Penny to adjust the Instruction Windage and Elevation Adjustment Screws. 6-Month Warranty for Quality and Service Gurantee and 100% refund for Quality problem.