HS403C is a solar and battery powered 20mm micro sight designed for rifle and carbine applications. HS403C features Holosun’s Red Super LED with 50k hour battery life, 10 daylight and 2 night vision compatible reticle intensity settings. Its housing is made from 6061 aluminum and includes both a lower 1/3 co-witness mount (1.63”) and a low mount (.75”) for low-comb height rifle applications. HS403C is unique in that it is always on and ready. If there is ambient light available, it will power the HS403C even without a battery. Additional features include digital buttons for setting changes, rubber lens covers, and a side-mounted battery tray for the 2032 battery. HS403C is a versatile sight for users of all levels. In the Box: Lower 1/3 Cowitness Mount, Low Profile Mount, T10 L Key, Rubber Cover, User Manual, CR2032 Battery, Lens Cloth. Optical Specs: Reticle: 2 MOA Dot; Light Wavelength: 650nm; Reticle Color: Red; Parallax Free: Yes; Unlimited Eye Relief: Yes; Magnification: 1x; Multi-Coatings: Yes. Electronic Specs: Power Source: Solar & Battery; Battery Type: CR2032; Battery Life: 50,000 hours; Brightness Setting: 10 DL & 2 NV. Physical Specs: Window Size: 20mm Diameter; Dimension: 2.45 × 1.43 × 1.6 in; Weight: 2.82 oz. Mechanical Specs: Housing Material: 6061 T6 Aluminum; Surface Finish: MAO; Adjustment per Click: 0.5 MOA; W&E Travel Range: ±50 MOA. Environment Specs: Storage Temperature: -40℃ to 70℃; Working Temperature: -30℃ to 60℃; Submersion: IP67; Vibration: 1000G.