The "e" is for "extreme." the exps3 offers true two-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.It is an excellent optic for the technologically advanced modern rifle hunter.Night vision-compatibility makes it a versatile choice for day or night hunting.This model has a black finish and a 65 moa ring/2 1 moa dots.Battery: CR123AMagnification: 1xObjective: 30x23mmField Of View: 30 yds @ 4" Eye ReliefEye Relief: UnlimitedDot Size: 1 MOALength: 3.80"Weight: 11.20 ozFinish: BlackReticle: 68 MOA Ring/2 1 MOA Red DotAdjustment Size: .5" @ 100 ydsProofs: Water ResistantOptic Coating: Anti-ReflectionWindage Elevation: 40 MOA