Discolight

Party on, change your very own Nintendo DSi system into a discolight.

Party on by changing your very own Nintendo DSi system into a disco light. Choose between several music genres such as Love, Hip Hop, and Rock. As a special feature, the Nintendo DSi system makes use of the "Disco Disco" functionality of Discolight. The Nintendo DSi system will then display colors to the rhythm of the music that you are currently listening to. Place several Nintendo DSi systems together and create your very own disco!

Source:

Nintendo.com Description