The Nintendo DS has two screens. One is just used for game playing, while the other is for touching with the Stylus. You can also play Game Boy Advance games on this handheld console. This console was unveiled on May 11, 2004 during the E3 2004 conference, and was released in North America on November 21, 2004, in Japan on December 2, 2004, and in Europe on March 11, 2005. The price was $149.99.
A more lightweight redesign of this console, the Nintendo DS Lite, at a price of $129.99, was unveiled on January 26, 2006, and was released in Japan on March 2, 2006, in North America on June 11, 2006, in Europe on June 23, 2006, and as the first console ever from Nintendo of Korea on January 18, 2007.
The Nintendo DSi, an enhanced version of the console, has even more capabilities than the original Nintendo DS, such as a Wi-Fi internet connection using the Nintendo Wi-Fi USB Connector, more RAM, and a larger screen. But unfortunately, it cannot play Game Boy Advance games, and it is region locked -- in other words, certain video games cannot be played on a DSi from another country.
The DSi was unveiled on October 2, 2008, and released in Japan on November 1, 2008, in Europe on April 3, 2009, and in North America on April 5, 2009. This console is priced at $169.99 ($149.99 for some units). There was also a Nintendo DSi XL, released in 2010 with more improvements over the Nintendo DSi.