With the Trijicon ACOG® 3.5x35 LED riflescope, users can select from six adjustable brightness levels with an “off” between each setting, allowing the user to determine how much to illuminate the reticle - even in transitional lighting. Powered by a single AA battery, the LED ACOG can run for over 12,000 continuous hours (on setting #4). Like all ACOG models, the 3.5x35 LED is designed with a forged 7075-T6 aircraft-grade aluminum alloy housing, making it nearly indestructible.