Cyelee Optics CAT0 Reflex Red Dot Sight 1x22x16mm 3 MOA Dot Black. It has a top-load battery you can only find in 200+ optics and features like a 7075-T6 aluminum body generously sized window and recessed buttons to prevent accidental presses during carry and usage. The CAT0 represents a revolution in pricing and quality with the easily apparent value of a larger window size than other popular and more expensive competitors. Specifications for Cyelee Optics CAT0 1x22x16mm Reflex Red Dot Sight: Manufacturer: Cyelee Optics Color: Black Fabric/Material: 7075-T6 Aluminum Magnification: 1 x Objective Window Size: 22x16 mm Reticle: 3 MOA Dot Illumination Type: LED Illumination Color: Red Brightness Settings: 10 Eye Relief: Unlimited Adjustment Click Value: 1 MOA Emitter Type: Open Parallax: Parallax Free Battery Type: Lithium Metal CR1632 Battery Life: Up to 50000 hours Water Resistance Level: IPX-7 Weight: 30 g Package Type: Box Red Dot Sights-Footprint: RMSc Lens Type: Multi Coated Gun Type: Pistol Package Contents: Cyelee Optics CAT0 1x22x16mm Reflex Red Dot Sight Cyelee Optics X004ER30I5: CAT0 Reflex Red Dot Sight 1x22x16mm 3 MOA Dot Black