"Unlock the full potential of your gaming! This GameCube,Wii,Wii U-Controller Adapter is a must-have for any serious gamer.

Whether you're reliving classic Super Smash Bros. battles on your Wii U or dominating PC games with the precision of a GameCube controller, this adapter has you covered. It's built for seamless plug-and-play action, offering rock-solid connections for up to four controllers. Don't miss out on the ultimate retro and modern gaming experience – grab it now and elevate your gameplay!" 

• Mode Button (SWITCH/Wii U ↔ PC): This switch allows you to select the operating mode of the adapter. Slide it to "SWITCH/WII U" when connecting to a Nintendo Switch or Wii U console, and to "PC" when connecting to a computer.
• Vibration Induction Line: This likely refers to the cable that carries the vibration signals from the console/PC to the GameCube controllers connected to the adapter, enabling rumble feedback during gameplay.
• Power Cord: The adapter uses one or more USB cables as "power cords" to connect to the console or PC. For full functionality, especially rumble, both USB plugs are typically needed, with one often providing power and the other handling data/rumble signals. 
  How to Use (General Steps):
  1. Select the correct mode using the mode button based on your system (Switch/Wii U or PC).
  2. Connect the power cord(s) to your console's or PC's USB ports. If using on Switch, connect to the dock.
  3. Connect GameCube controllers to the adapter's input ports.
  4. On PC, you may need specific drivers (e.g., Zadig for Dolphin emulator) to recognize the adapter properly.
  5. Enjoy your GameCube controllers on your chosen platform.