The HE407C-GR X2 is an open reflex optical sight designed for full-sized pistol applications. The HE407C-GR X2 improves on previous versions by adding Lock Mode which was first introduced in our 2018 LEM pistol optic models. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes. Additional features include Holosun's Green Super LED with up to 50k hour battery life, Solar Failsafe, precision 2MOA dot, and Shake Awake. The durable housing is made from 7075 Aluminum, uses an industry standard footprint, and houses the 1632 battery in a side-mounted tray for easy replacement when needed. Reticle: 2 MOA Dot Reticle Color: Green Dot Height: 0.65" Footprint: RMR Parallax Free: Yes Unlimited Eye Relief: Yes Magnification: 1x Multi-Coatings: Yes Power Source: CR1632 Battery Battery Life: 50,000 Hours Brightness Settings: 10 Day Light & 2 Night Vision Weight: 1.5 oz Housing Material: 7075 T6 Aluminum Adjustment Per Click: 1 MOA W&E Travel Range: + or - 50 MOA Submersion: IP67 Vibration: 5000G Color: Black