1.mp3 case(the case that you get when you buy the mp3
if you dont know what I mean see picture 2)
3.speaker already made with audio jack see step
thats all you need.
Step 1: Cut out the hole
Step 2: Holes
Step 3: The speaker
well all you need is an audio jack 3.5mm or 2.5mm or whatever type you have, wire 2 strands, soldering iron, solder, and a speaker.
step 1:strip the wires but not to long and solder them on to the audio jack.
step 2:then do the same thing in step1 but solder them onto the speaker.
Step 4: Hook it up
and now put your mp3 on to the holder and hook up the audio jack into the mp3 jack and turn on your mp3 and listen to your tunes and recycle or you can say reuse.