This project has so many different applications, from the whole "cable is to short to reach", now you have no limitations on how far you can transmit the sound, or the Wires all over the room problem. Use your imagination and figure additonal ones out :)
Sound from a speaker is really just energy at different levels that makes a speaker turn into sounds that we can hear.... we'll explain everything in a few minutes. Watch this video if you don't feel like reading or go to our next step.
Step 1: Getting the Supplies
Alright unless you want to make this a permanent project we recommend you use alligator clips. They will help you out in the long run.
So you will need several alligator clips
A laser pointer
an Altoids Can (optional)
A solar cell
an Audio Output Transformer
An Audio phone jack
and a battery pack
Easy to get enough at Ebay or your local Radio Shack