Holosun's newest SCS (Solar Charging Sight), the SCS-MP2-GR was designed to fit the Smith & WessonA(R) M&P-M2.0(TM) full size, 9mm & 40S&W handguns (will not fit 1.0 or Shield(TM) models). 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 power reserve 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 loc Mfg: Holosun