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.Its night vision-compatibility makes it a versatile choice for day or night hunting.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/4 1 MOA Red DotAdjustment Size: .5" @ 100 ydsProofs: Water Resistant/FogproofOptic Coating: Anti-ReflectionWindage Elevation: 40 MOA