The best just got better. The 518 offers all the features of EOTECH's top-tier EXPS sight, now powered by easy-to-find AA batteries. With side-mounted buttons and a quick-detach lever, it allows close positioning to a magnifier, saving valuable rail space without compromising performance.Specifications and Features: L x W x H: 5.6" x 2.2" x 2.9" (142.2 x 55.9 x 73.7 mm) Weight: 13.8 oz (391.2 g) Mount: 1" Weaver or MIL-STD-1913 rail Windage & Elevation Adjustment: 0.5 MOA per click Night Vision Compatibility: No Brightness: 20 daylight settings Power Source: 2 x 1.5 V AA batteries - Supports lithium, alkaline or rechargable Country of Origin: Made in USA