The HE507C-X2 is an open reflex optical sight designed for pistol applications. Features include Holosun's green Super LED with up to 50k hours battery life, Multi-Reticle System, Solar Failsafe, and Shake Awake. Tech & Features MRS: Circle Dot; 2 MOA Dot; 32 MOA Circle Super Green LED Up to a 50,000 Hours Battery Life (Setting 6) 12 Brightness Setting: 10 DL & 2 NV Compatible Convenient Tray Battery Compartment Parallax-free & Unlimited Eye Relief Optical Data Reticle2 MOA Dot & 32 MOA Circle Light Wavelength540nm Reticle ColorGreen Parallax FreeYes Unlimited Eye ReliefYes Magnification1x Multi-CoatingsYes Electronic Data Power SourceSolar & Battery Battery TypeCR1632 Battery Life (Hours)50000 Brightness Setting10 DL&2 NV Physical Data Window Size0.63x0.91 Dimension (in)1.78x1.15x1.15 Weight (oz)1.5 Mechanical Data Housing Material7075 T6 Aluminum Surface FinishAnodize Adjustment per Click1 MOA W&E Travel RangeA 50 MOA Environmental Data Storage Temperature-40~70 Working Temperature-30~60 SubmersionIP67 Vibration5000G