Battle-tested by frontline American warriors from the Stryker Brigade, 10th Mountain Division, and 3rd Infantry, the night vision compatible EOTech HWS 552 holographic sight is powered by AA batteries and fits on both 1" Weaver and Mil-Std-1913 rails. NIGHT VISION COMPATIBLE L X W X H 5.6” x 2” x 2.5” (143 x 51 x 64 mm) WEIGHT 11.5oz (325 g) WATER-RESISTANT 33 ft. (10 m) depth MOUNT 1” Weaver or MIL-STD-1913 rail BRIGHTNESS 20 daylight settings10 additional settings for Gen I through III+ night vision devices POWER SOURCE 2 x 1.5 V AA batteriesSupports CR123, alkaline, or rechargeable BATTERY LIFE CR123: 2,500 continuous hours at nominal setting 12 at room temperature.AA alkaline: 2,200 continuous hours at nominal setting 12 at room temperature. COUNTRY OF ORIGIN Made in USA