The SIG SAUER ROMEO 4DR 1X20 is essentially the ultimate red dot sight when rapid accurate target acquisition is required. It is ideal for moving targets, dangerous game and close quarter tactical situations. The ROMEO 4DR features peak performance coatings for astonishing light transmittance and red dot contrast in all situations. its small and firm size and weight make this the ideal red dot, and the everlasting eye relief and ultra-low parallax performance is unmatchable at this price point. The already inserted CR2032 battery gives you up to 50,000 hours or run time.