For: Picatinny; Mil-Spec; Weaver Style Rails (w/ minimum rail length of 1.75") Battery Type: 1/3N Lithium (2) Accuracy: User-adjustable for windage & elevation Wavelength: 532nm (green) Power Output: 5mW Spot Size: 5/16" @ 7 Yds; 3/4" @ 25 Yds