Like many of Holosun's premium optics, the HE403B FDE is equipped with the Shake Awake function, which automatically activates the reticle at the slightest movement, and deactivates it after a period of motionlessness. This means the HE403B FDE is ready as soon as the host weapon is picked up, and will automatically deactivate to preserve battery life. The reticle is illuminated by Holosun's Super LED and features 12 levels of brightness intensity - 10 daytime, 2 night vision - allowing the reticle to adapt to the surrounding light levels. In addition, the HE403B FDE is outfitted with multilayer lens coatings to maximize light transmission and reduce glare. Objective Lens Diameter- 20 mm.
Attachment/Mount Type- 1/3 Co-Witness Mount, Low Profile, Quick Release. Battery Life- Up to 5 years.
Operating Temperature- 22 - 140 Fahrenheit. Water Resistant Mark- 1 m. Included Accessories- 1/3 Co-witness Mount, Low Mount.
Brightness Index- 2NV / 10DL. W/E Travel at 100 Yds- 50 MOA.