The “E” is for “Extreme.” The EXPS3 offers true 2-eyes-open shooting and a 7 mm raised base that still allows for iron sight access. It features easy-to-adjust side buttons and an adjustable, locking, quick-detach lever for easy attachment and removal.EXPS3 was chosen by the U.S. Special Operations Command (USSOCOM) as their primary optic for close-quarter engagements.It is also the optic of choice for the technologically advanced modern rifle hunter. Its night vision-compatibility makes it a versatile choice for day or night hunting.
Night vision compatible

Length/Width/Height:3.8” x 2.3” x 2.9” (96.5 x 58.4 x 73.7 mm)
Weight:11.2 oz (317.5 g)
Water Resistant:Submersible to 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:One 123 lithium battery
Battery Life:600 continuous hours at nominal setting 12 at room temp.