Eotech has done it again by making the best even better. Offering true 2 eyes open shooting, a transversely mounted lithium 123 battery, and 7 mm raised base offering iron sight access, the new Extreme-XPS (EXPS) features easy to adjust side buttons and a single, quick release throw lever for easy attachment and removal. Features: - Reticle is a 68 MOA circle with 1 MOA aiming dot - Single transverse 123 battery to reduce sight length - Shortened base only requires at most 2 3/4 inch of rail space compared to the 4 inch N battery sights - Battery cap and latch are eliminated and replaced with a simple O-ring, tethered cap better sealing is achieved - Battery compartment is now separated from the base to allow it to hover over the delta ring of the rifle - Average battery life at brightness level 12 is roughly 500-600 hours, 3X battery life of N cell sights - Side buttons, NV compatible with a single quick detach throw lever Specifications: - Length: 3. 80" - Width: 2. 30" - Height: 2. 9" - Weight: 11. 2 oz - Mount: 1" Weaver or Mil-Std 1913 Rail - Power Source: 3 Volts, 1 123 Lithium Battery - Brightness: 30 Settings (10 For Night Vision) - Water Resistance: 33 Feet (10 Meters) - Battery life: Approximately 600 Hours at Nominal Setting 12 at Room Temperature - Night Vision Compatible: Gen I-III - Reticle: 68 MOA Ring with 1 MOA Dot - Color Tan.