The HWS 552 is the most popular night vision-compatible holographic weapon sight offered. The AA battery is available globally making these models a favorite. The mount is compatible with both 1" Weaver and MIL-STD-1913 rails. Specifications: Dimensions: 5.6"L x 2"W x 2.5"H Weight: 11.5oz Water Resistant: 33ft Depth Mount: 1" Weaver or MIL-STD-1913 Rail Windage & Elevation Adjustment: 0.5 MOA per Click Brightness: 20 Daylight & 10 Additional Settings for Gen 1 Through Gen 3+ Night Vision Devices Power Source: 2x 1.5V AA Batteries; Supports Lithium, Alkaline, or Rechargable Battery Life: Lithium: 2,500 Continuous Hours at Nominal Setting 12 at Room Temperature Alkaline: 2,200 Continuous Hours at Nominal Setting 12 at Room Temperature Operating Temperature: -40Adeg F to 140Adeg F Country of Origin: USA Reticle: Eotech's most popular reticle offered, the 68 MOAring with a 1 MOA dot provides three usable aiming points.