I suppose the only "instruction" here is an interesting pair of parts at a good price, since you couldn't get much simpler on assembly. But hey, if it's OK for the throwies, then why not this?
I'm hoping that someone more creative than I will find a good application for this. Noise grafiti? Halloween noises?
Step 1: Buy $5 MP3 player
for a really cheap MP3 player. BG Micro is selling MP3 players for $5/ea, quantity 3 or more. I bought 3, I figured I might pull one apart and see what kind of parts they have. You can order this part at http://bgmicro.com/search.asp?textsearch=AUD1081. If you put in 3 or more, it should give you a $5/per total instead of the $5.95.
Incidentally, I didn't get the first order they shipped via US Priority Mail. I emailed their sales people, and they just reshipped without any hassle or suspicion, nice people.
Open your package, and extract the MP3 player holder in all its glory.