ATN Night Spirit-CGT Gen CGT Night Vision Monocular Multi Purpose System is a versatile night vision devise. This compact, yet rugged unit can be hand held or head-mounted for hands free use (with optional head gear or helmet mount). The integrated infrared illuminator enhances the ability of the user to read maps and operate in confined, zero light areas. Waterproof. Requires one 1.5V AA size battery, included. ATN Corp manufactures and distributes the widest array of Night Vision and high quality optics in the world. We are a sales and market leader in the US. Unsurpassed customer service on both our website and 800#, our technicians are the most knowledgeable in the world. We manufacture for the US Military, law enforcement, the FBI and the US Department of Homeland Security.