The Primary Arms CLx RD-23s Red Dot Sight is a feature packed optic for your favorite rifle. Integrated with Solar Failsafe technology, you won't have to worry about this sight failing you when you forget to change out the battery. The CLx RD-23s is night vision compatible and features easy to use push button controls. FeaturesMulti Coated LensSolar Backup PowerNight Vision Compatible23mm Lens Diameter