Very similar to the official Nintendo controllers, but with 'Turbo'(auto-fire) as well.
White colour to match the Wii, but can be used with Gamecube or Wii(see notes below)

Features:
- Pressure-sensitive analog triggers
- Analog thumb sticks
- Buttons = all the normal gamecube controller buttons
- Vibration feedback
- 'Turbo' = turn auto-fire on for any button(s) = once set, holding a button will act like you're pressing the button repeatedly.
= to set Turbo, hold Turbo button down, & press the button(s) you want to set Turbo for. Repeat to turn it off.
- 'Macro' = actually just seems to act like repeatedly pressing the Start button. I assume this is to achieve a kind of slow-motion effect, but I don't think there's any practical purpose for it.
- LED flashes behind logo when 'Turbo'(when pressing a button with turbo being used for it) or 'Macro' function is being used.

Wii compatibility:
Main use for this with Wii would be to play Gamecube games, & 'Virtual Console'(downloaded) games. It will work with almost all 'Virtual Console' games, apparently there are some TurboGrafx-16 games it won't work with though.
I suspect most Wii disk-based games won't support Gamecube controllers.
At least some Wii games do support Gamecube controllers though, for example Rugby League 3

These don't come with a retail box, but will be packaged to prevent damage.