The company promises "thousands of games" on release - but marquee launch title Halo Infinite has been delayed until 2021.
It said customers in 12 countries - including the UK, US, Australia and South Korea - would be able to pay for the consoles and a gaming pass through a monthly plan starting at $24.99 for two years.
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The Series S Xbox will not have a disc drive, relying on users to download and stream games, while the larger Series X keeps it.
Microsoft said the Series S would "deliver everything that is core to next-generation gaming - faster load times, higher frame rates, and richer, more dynamic worlds".
Source: https://news.sky.com