Classic Controller

Nintendo Wiki has an article on Classic Controller.

The original Classic Controller

During E3 2006, Nintendo introduced a Classic Controller, which plugs into the Wii remote via a cord in a similar fashion as the Nunchuk. The overall configuration is similar to that of other major seventh generation console controllers.

The Classic Controller features two analog sticks, a D-pad, a, b, x and y buttons, the L and R shoulder buttons, and two Z buttons (labeled ZL and ZR) next to the L and R buttons, respectively. It also has a set of -, Home, and + buttons like those on the Wii remote.

The newer Classic Controller Pro, in black; the controller was released a year after the release of Brawl.

In 2009, Nintendo released a revision of the Classic Controller named the Classic Controller Pro, with a new wing grip design and the ZL and ZR buttons relocated behind the L and R buttons as secondary shoulder buttons, in the vein of the Z button on the GameCube controller. As it was released after Brawl, the game makes no reference to the new model; all images show the original Classic Controller. However, the controller is fully compatible with Brawl, and is considered the superior controller by competitive players.

[edit] In the Super Smash Bros. series

The four different controllers available for use with Super Smash Bros. Brawl.

In Super Smash Bros. Brawl, the Classic Controller can be used as a viable control scheme, along with the standalone Wii Remote, the Wii remote and Nunchuk combination, and the GameCube controller.

The Classic Controller can also be used for Super Smash Bros. by using the Virtual Console.