The XPS2 is the shortest, smallest and lightest EOTech model holographic weapon sight available without night vision. Its size and weight make it convenient for hunters and law enforcement officers to carry. It is also fast and runs on a single CR123 battery. The compact, single-lithium-battery configuration leaves more rail space than ever for rear iron sights or magnifiers. This sight has the same body style as the XPS3 model, but the XPS2 does not have night vision-compatibility. Product Specifications Night Vision-Compatibility: None Mount: 1" Weaver or Mil-Std 1913 Rail Dimensions: L-3.8" W-2.1" H-2.5" Weight: 9.0 oz Power Source: One CR123 Lithium Battery Battery Life: 600 Continuous Hours (Nominal Setting 12, at Room Temp) Water Resistant: Submersible to 10 ft