Big Dragon - MOD.7 557 Holographic Sight - Black is a replica Holographic sight based on EoTechs Design, allowing the user to keep both eyes open when shooting and quicker target acquisition compared to traditional iron sights. The sight is constructed from Alloy and features an adjustable Red / Green Picture, for standard and night vision use. The sight features left hand side buttons, rather than traditionally being at the back, to allow the user to adjust the sight even when using a magnifier. These types of sights are great for two-eyed shooting as it allows you to bring up your rifle quickly, and wherever the picture lands your rifle will be aiming. The sight is powered by a CR123 Battery, making it a great combination with Stocks which feature battery compartments. This is the perfect purchase for any Airsoft Skirmisher who is looking for a Short Holographic, or for those that want to power their Airsoft Kit using a Standardized Battery.