The ROMEO-MSR is a sealed compact red dot or green dot sight intended for MSR, carbine, shotgun and air rifle. Brightness is adjusted with a top-mounted rotary dial, featuring 10 daytime and 2 night vision settings for quick target engagement in any condition. Features: - High-performance lens coatings for excellent light transmission and dot contrast in any situation. - Ultra-compact size and weight with unlimited eye-relief and parallax-free operation. - Precise 2 MOA Dot - Slipover, see-through flip-backs - 1.41" T10 Torx M1913 Skeletonized lightweight Riser Mount for absolute co-witness - Top loading battery compartment with integral brightness control featuring 10 daytime and 2 NV settings - Over 20,000 hours runtime on a CR1632 battery - Aircraft grade aluminum housing and mount - Dependable IPX-7 waterproof and fog-proof performance