The DIY speakers play sound out of a cup that is attached to magnets and chords that can plug into your phone. The DIY speakers have an audio chord into which you plug in your phone. The electromagnetism powers the speakers
Tutorial
1st you get a stack of magnets, wrap it in 2 sheets of paper and tape it. Then you wrap the paper rolled magnets with wire 80 times, leave the two ends of the wire out. Hot glue the wire together and burn the enamel off of the ends of th wire.