Nintendo DS
The Nintendo DS, short for "Dual Screen", introduced distinctive new features to handheld gaming: two LCD screens working in tandem, the bottom one featuring a touchscreen, a built-in microphone, and support for wireless connectivity featuring 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 device went on sale in North America on November 21, 2004.