The Pokémon mini (ポケモンミニ?) is a handheld game console designed and manufactured by Nintendo and themed around the Pokémon media franchise. It is the smallest game system with interchangeable cartridges ever produced by Nintendo, weighing just under two and a half ounces (70 grams). It was first released in North America on November 16, 2001, then in Japan on December 14, 2001, and in Europe on March 15, 2002. The systems were released in three colors: Wooper Blue, Chikorita Green, and Smoochum Purple.
Features of the Pokémon mini include an internal real-time clock, an infrared port used to facilitate multiplayer gaming, an accelerometer, and a vibrator used to implement force feedback.
Source: Wikipedia, "Pokemon mini", available under the CC-BY-SA License.