The HE407K-GR X2 is an open reflex optical sight designed for concealed carry pistol applications. The X2 Series pistol optics feature two improvements. First is the addition of Lock Mode from our 2018-2019 LE pistol optic models. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes. Second, the buttons have been redesigned to compliment the Lock Mode by placing them lower and out of the way. Additional features include Holosun s Super Green LED with up to 50k hours battery life, and Shake Awake. Product Features 6 MOA Green Dot Reticle Up to 50,000 Hours Battery Life (Setting 6) 12 Brightness Setting: 10 DL & 2 NV Compatible Convenient Side-mounted Battery Compartment Parallax-free & Unlimited Eye Relief Product Specifications Reticle: 6 MOA Dot Light Wavelength: 540nm Reticle Color: Green Parallax Free: Yes Unlimited Eye Relief: Yes Magnification: 1x Multi-Coatings: Yes Power Source: Battery Battery Type: CR1632 Battery Life: 50,000 Hours Brightness Setting: 1 DL&2 NV Weight: 1 oz Housing Material: 7075 T6 Aluminum Surface Finish: Anodize Adjustment per Click: 1 MOA W&E Travel Range: +/- 30 MOA