Sitka Flash 20 Color:Optifade Subalpine dust and debris from penetrating dust and debris from penetrating for reliable performance in all environments Shockproof Rugged construction withstands recoil and impact Hard Anodized Finish Highly durable low glare matte finish Operating Temperature Rated from 4 degrees to +158 degrees Fahrenheit Multi Height Mount System Includes a spacer shim that can be utilized to provide two different mounting heights: lower 1 3 co witness (40 mm) & absolute co witness (37 mm) Unlimited Eye Relief Non critical eye relief for rapid target acquisition Battery Life 12 hour auto shutdown feature maximizes battery life Professional patterns and web designs