I had a few of these when I was a kid and they were great fun. You basically only have four notes in C Major (8 reeds total) but you can play a few simple songs including, but not limited to, songs in C Major.
You can get this 3.5cm long harmonica for only $23.45 at LatestBuy.com and I think you should. There’s not enough harmonica music in the world today, friends. Not enough at all.