NC STAR's LIO 4x34mm Blue Illuminated Scope with NAV Red/White LED Lights is designed to be the ultimate marksman's optic. The wide 34mm objective and 3.1" eye relief makes for incredibly easy viewing. Fixed 4x magnification makes for easy target identification at even long distance ranges. When the target is close, there are built-in back up iron sights on the top of the scope to use as well. The Urban Tactical MIL-DOT reticle can be toggled between unlit and 5 different brightness levels of blue illuminated settings. MIL-DOT scopes makes using "Kentucky Windage" to get your shots on target quickly and easily. This scope can be easily attached or removed for storage from any standard 1913 picatinny/weaver rail by using the quick-detach locking lever. Using 3 CR123A batteries (included), this scope also has built-in NAV LED lighting. By combining both red and white LEDs, and the ability to use 4 different lighting modes to prevent loss of night vision, this scope is an excellent choice for both day time and low-to-no light conditions. Constructed from durable, lightweight anondized aluminum, this scope is built to last.