Nintendo DS

The Nintendo DS, is a dual-screen handheld game console developed and released by Nintendo. The device was the first Nintendo game console to launch outside of Japan when it went on sale in North America on November 21, 2004.

The DS, short for dual screen, introduced distinctive new features to handheld gaming: an LCD screen working in tandem with a touchscreen, a built-in microphone, and support for wireless connectivity. Both screens are encompassed within a clamshell design similar to the Game Boy Advance SP. The Nintendo DS also features the ability for multiple DS consoles to directly interact with each other over Wi-Fi within a short range without the need to connect to an existing wireless network. Alternatively, they can interact online using the Nintendo Wi-Fi Connection service.

The Nintendo DS design resembles that of the multi-screen games from the Game & Watch line, such as Donkey Kong and Zelda, which was also made by Nintendo.
The lower display of the Nintendo DS is overlaid with a touchscreen designed to accept input from the included stylus, the user's fingers, or a curved plastic tab attached to the optional wrist strap. The touchscreen allows users to interact with in-game elements more directly than by pressing buttons; for example, in the included chatting software, PictoChat, the stylus is used to write messages or to draw.
The handheld features four lettered buttons (X, Y, A, B), a directional pad, and Start, Select, and Power buttons. On the top of the device are two shoulder buttons, a game card slot, a stylus holder and a power cable input. The bottom features the Game Boy Advance game card slot. The overall button layout resembles that of the Super Nintendo Entertainment System controller. When using backward compatibility mode on the DS, buttons X and Y and the touchscreen are not used as the Game Boy Advance line of systems do not feature these controls.