It connects to the port expansion that has the main control of Wii cable, adds new buttons: C and Z, and an analog joystick for games that require a more complex.
As commanding Wii, includes a motion sensor 6-axis that can be used in multiple ways depending on the game. It can be a shield in a game fight with swords, a fist in a game of Boxing, a minivela ...
4 controls can be connected with its Wii Nunchako for the time.