For Wii nunchuk controller:

1). The Nunchuk builds on the simplicity of the Remote and goes an extra step to meet the needs of specific types of games. The Nunchuk connects to the Remote at its expansion port and is used in conjunction with the Remote.

2). Along with the analog stick, the motion-sensing Nunchuk also contains two buttons positioned for quick access. Because the Remote and Nunchuk are only relatively dependent on each other, players are free to hold them in whichever hand is most comfortable.

Features:
1). Contoured perfectly to fit a players hand, the Nunchuk controller builds on the simplicity of the Remote controller.

2). The Nunchuk contains the same three-axis motion sensor found in the Remote, but also includes an analog stick, and two buttons to help assist in character movement.

3). Uses the communication function of the Remote Control.

4). Connects Directly into Controllers.

5). Required for Various Types of Games.