The SCS-VP9-GR (Solar Charging Sight) is designed for the H&K VP9 optics ready handguns. It is designed to attach directly to the slide without an adapter plate and uses our innovative solar charging system with multi-directional light sensors to automatically adjust brightness in dynamic situations. The SCS can potentially operate indefinitely using an internal, rechargeable 20,000-hour battery meaning under even moderate exposure to bright light, you will never need to change batteries again. The SCS also includes an intensity override function which locks the optic into a high brightness mode for 30 minutes and a low power indicator which warns of low battery days before charging is needed. Product Features Direct mount to H&K VP9 series handguns Solar charging system with internal rechargeable battery Multiple Reticle System (MRS): 2 MOA dot, 32 MOA circle, or combination Auto-adjusting brightness with manual override Super Green LED reticle Parallax-free with unlimited eye relief Internal battery level indicator 7075-T6 aluminum housing for maximum durability IP68 waterproof and shock resistant Product Details Window Size: 0.58" x 0.77" Dimensions: 1.93" x 1.03" x 0.91" Weight: 1.3 oz Reticle: Multiple Reticle System (MRS) Adjustment per Click: 1 MOA W&E Travel Range: 30 MOA Housing Material: 7075-T6 Aluminum Finish: Anodized Waterproof Rating: IP68 Operating Temperature: -30? to 60? Storage Temperature: -40? to 70?