Tenori-on is an electronic musical instrument, designed and created by Japanese artist, Toshio Iwai and Yu Nishibori of the Music and Human Interface Group, Yamaha Center for Advanced Sound Technology. It consists of a screen, held in the hands, of a sixteen by sixteen grid of LED switches, any of which can be activated in a number of ways to create an evolving musical soundscape. The LED switches are held within a aluminum frame, which has two built-in speakers located on the top of frame, as well as a dial and buttons that control the type of sound and beats per minute produced. There is also an LCD screen on the bottom edge of the frame. Using the connection function, it is possible to play a synchronized session, or to send and receive songs between two of the devices. (Wikipedia)
See also: Monome