Nintendo Ds from: wikipedia

The Nintendo DS, sometimes abbreviated to DS or NDS) is a two-screen handheld game console made and patented by Nintendo. It was launched in 2004 in Canada, the United States, and Japan. The console features a clamshell design, just like the Game Boy Advance SP,  except with two screens with one being touchscreen. The Nintendo DS also has a built-in microphone and includes wireless (Wi-Fi) standards, allowing players to text in a fun way being able to draw with their pen onto the touch screen, with each other within short range about 10–30 m, depending on conditions or online with the Nintendo Wi-Fi Connection service, which released later in the console's lifespan. This was the first Nintendo console to be released in North America prior to Japan.  Developers of  this new game designed the system  to inspire, and "Dual Screen", the system's most obvious and distinct feature.