The SCS-MOS (Solar Charging Sight) is a direct attachment optic for full-size GLOCK MOS systems offering the lowest profile deck height for use with standard-height iron sights. The SCS-MOS combines solar power, rechargeable power storage, an auto-adjusting reticle brightness system with override function to potentially operate indefinitely in multiple lighting conditions. Product Features Multiple Reticle System (MRs): 2 MOA Dot Only, 32MOA Circle Only 2 MOA Dot with 32 MOA Circle. Self Adjusting Brightness Control with Override Function. Direct Attachment to Glock MOS system. Parallax-free & Unlimited Eye Relief Internal Battery Level Indicator. Grade 5 Titanium Housing. Super Green LED. Product Specifications Reticle: 2 MOA Dot & 32 MOA Circle. Light Wavelength: 540nm. Reticle Color: Green. Parallax Free: Yes. Unlimited Eye Relief: Yes. Magnification: 1x. Multi-Coatings: Yes. Power Source: Solar & Battery. Battery Type: Internal Rechargeable Battery. Battery Life: Unlimited hrs. Brightness Setting: Auto. Window Size: 0.58x0.77. Dimension : 1.93 1.03 0.91". Weight: 1.3oz. Housing Material: Titanium. Surface Finish: Titanium. Adjustment per Click: 1 MOA. W&E Travel Range: 30 MOA. Storage Temperature: -40?~70?. Working Temperature: -30?~60?. Submersion: IPX8. Vibration: 5000G.