The EOTech EXPS2 Holographic Weapon Sight by EOTech offers true two eyes open shooting, a transversely mounted lithium 123 battery, and 7 mm raised base offering iron sight access. The EOTech EXPS2 Holographic Sight w/ 68MOA Circle & 1 MOA Aiming Dot features easy to adjust side buttons and an adjustable, locking, quick detach lever for easy attachment and removal. With an astounding 600+ hour battery life, the EOTECH EXPS2 Holographic Red Dot Weapon Sight ensures that you acquire your target time after time. The EOTech EXPS2 Holographic Sight w/ QD Lever improves precision and accuracy, no matter the style or quality of the weapon.