The HS407C is an open reflex optical sight designed for pistol applications. Features include Holosun's Super LED with up to 50k hours battery life, 2MOA dot only, Solar Failsafe, and Shake Awake. Features: Reticle: 2 MOA Dot Light Wavelength: 650nm Reticle Color: Red Parallax Free: Yes Unlimited Eye Relief: Yes Magnification: 1x Multi-Coatings: Yes Power Source: Battery Battery Type: CR1632 Battery Life (Hours): 50000 Brightness Setting: 10 DL&2 NV Housing Material: 7075 T6 Aluminum Surface Finish: Anodize Adjustment per Click: 1 MOA W&E Travel Range: A 50 MOA Window Size: 0.63x0.91 Dimension (in): 1.78x1.15x1.15 Weight (oz): 1.5 Storage Temperature: -40?~70? Working Temperature: -30?~60? Submersion: IP67 Vibration: 5000G