The Holosun ARO-CORE Gold 2MOA Dot Electronic Scope features a refined 22mm optical window, 2 MOA red dot reticle, and 1x magnification for a clear sight picture with unlimited eye relief and no parallax. Shake Awake(TM) technology helps conserve battery life, while 10 daylight and 2 night-vision brightness settings provide customizable visibility, and Lockout Mode helps prevent accidental adjustments. Its durable aluminum housing features a low-reflection MAO finish and IP67-rated waterproof and dustproof protection, withstanding temperatures from -30degC to 60degC and vibration up to 1000G. A side-loading CR2032 battery tray allows tool-free battery replacement, with up to 50, 000 hours of battery life at setting 6. Compact and lightweight at 3.38 oz., the optic measures 2.48 x 1.54 x 2.63 inches and includes both a 1.63" lower 1/3 co-witness mount and a 1.05" low mount for flexible installation.