How many Atari VCS have been sold?

How many Atari VCS have been sold?
Atari 2600

Four-switch VCS model (1980–1982)

Introductory price
US$189.95 (equivalent to $850 in 2021)

Discontinued
January 1, 1992

Units sold
30 million (as of 2004)

Media
ROM cartridge

Atari 2600
Four-switch VCS model (1980–1982)
Introductory price US$189.95 (equivalent to $850 in 2021)
Discontinued January 1, 1992
Units sold 30 million (as of 2004)
Media ROM cartridge