How can you connect GameCube to a Techlux portable DVD player?

To connect a GameCube to a Techlux portable DVD player, you'll need to use the appropriate video input options. Most portable DVD players have a composite AV input, which means you can use a composite AV cable (with yellow, red, and white connectors) to connect the GameCube's AV output to the DVD player's input. Make sure to switch the DVD player to the correct input source to display the GameCube's video and audio. If the portable DVD player does not support AV input, this connection may not be possible.