The EOTech Model EXPS3 Weapon Sight features an innovative design that allows for true two-eye shooting, 7mm raised base still allowing iron sight access. Plus, easy to adjust side buttons an an adjustable, locking quick detach lever for easy attachment and removal. -2 68 MOA Ring w/ (2) 1 MOA Dots Night Vision Compatible Gen I-III Dimensions: 3.8"L x 2.3"W x 2.9"H (96.5 x 58.4 x 73.7mm) Weight: 11.2 oz / 317.5 g Brightness: 30 settings (10 for night vision) Power Source: 3 Volts, (1) 123 Lithium battery Battery Life: Approximately 600 at nominal setting 12 at room temperature