The Nintendo DS is a Nintendo handheld video game system initially released on November 21, 2004 in North America. The Nintendo DS features a clamshell design, similar to the dual screen Game & Watch games and the Game Boy Advance SP. The handheld is noted for having two screens, the lower one being a touch screen. In addition to the touch screen functionality, the DS also includes a built in microphone and, a first for a Nintendo handheld, wi-fi capabilities. A stylus comes packaged with every Nintendo DS system that can be placed into a slot when not in use. Four iterations of the Nintendo DS have been released including the original piece of hardware, the Nintendo DS Lite, the Nintendo DSi, and the Nintendo DSi XL. The successor to the Nintendo DS line is the Nintendo 3DS, a handheld similar in appearance that can produce 3D graphics without the need for glasses.