The SCS (Solar Charging Sight) is designed for Walther PDP 2.0 optics ready handguns. It is designed to attach directly to the slide without an adapter plate and uses our solar charging system with multidirectional light sensors to automatically adjust brightness. The SCS can potentially operate indefinitely using an internal, rechargeable 20,000-hour battery meaning you will never need to change batteries again. Included is an intensity override function which locks the optic into a high brightness mode for 30 minutes. Specifications for Holosun SCS Solar Charging Sight for Walther Arms 1x: Manufacturer: Holosun Color: Black Magnification: 1 x Objective Lens Diameter: 0.58 - 0.77 in Reticle: 32 MOA Circle, 2 MOA Dot Illumination Type: LED Illumination Color: Green Eye Relief: Unlimited Adjustment Click Value: 1 MOA Emitter Type: Open Battery Type: ML1220, Lithium Metal Gun Make: Walther Gun Model: Walther PDP Weight: 1.35 oz Condition: New Features of Holosun SCS Solar Charging Sight for Walther Arms 20,000-Hour Power Reserve Solar Charging Internal Battery Multi-Sensor Auto Brightness Brightness Intensity Override System Multiple Reticle SystemTM (MRS): 32 MOA Circle & 2 MOA Dot; 2 MOA Dot; 32 MOA Circle Direct Fit For Walther PDP 2.0 Optics-Ready Handguns Package Contents: Holosun SCS Solar Charging Sight for Walther Arms Multi Tool Lens Cloth User Manual