556 Holographic Sight With Flip Cover Features - 556 holographic Red & Green dot sight - Black anodized aluminum body - 20 levels brightness intensity adjustment per color - Windage and elevation adjustment - Integrated with 20mm or 5/8? weaver rail - Anti-glare reflective coating on front lens - Anti-fog lens, excellent optical clarity - Compact, light weight, low power consumption for long battery life Specifications - Construction: Aluminum and ABS - Color: Black - Magnification: 1x - Rail type: 20mm or 5/8? picatinny weaver - Dimensions (L x H x W): 93 x 64 x 60mm or 3.7 x 2.5 x 2.4? - Battery: 1 x CR123A (included)