The ROMEO7 full-size red-dot sight provides the civilian and armed professional with a robust 1x aiming solution optimized for today's MSR platforms" regardless of caliber. The battery life lasts an amazing 62"500 hours (on medium setting) and the low AA battery compartment allows for quick battery replacement without having to remove the sight from the firearm. The high performance lens coating allows for not only excellent light transmission and zero distortion" but also allows for the highest possible dot brightness. Features Low Dispersion (LD) glass lens design with high performance coatings for excellent light transmittance and zero distortion. The 2 MOA dot is optimal for close quarters battle to mid-range target engagement. The ROMEO7 includes both a standard QD mount and a low-rise fixed mount to fit a variety of systems. Dependable waterproof (IPX-7 rated for complete water immersion up to 1 meter) and fog-proof performance. The ROMEO7 was engineered with the centerline of the optical axis at 1.535" above the top of an M1913 Picatinny rail interface for night vision compatibility.