Buy the EOTECH EXPS3 Holographic Weapon Sight with 2 dots from BattleHawk Armory! 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. It's night vision-compatibility makes it a versatile choice for day or night hunting. EOTECH MODEL EXPS3 HWS a Finish: Black a Reticle: 68 MOA Ring with two 1-MOA dots a Compact lightweight sight offers true two eyes open shooting a Gen I-iii Night Vision compatible a Easy-to-adjust side-button design mates close w/magnifier (sold separately) a 7mm raised base offers iron sight co-witness access in the lower third of the viewing window a Quick-detach lever mount fits 1" Weaver or Mil-std 1913 rail a Non-reflective finish a Water-resistance: 33 ft. a Powered by (1) 3V 123 lithium battery a Battery Life: 600 continuous hours at nominal 12 setting at room temp. a Size: 3.8" x 2.3" x 2.9" a Wt.: 11.2 oz.