This thing deflects sound coming out of your iPhone speakers and focuses it into a more confined area and makes the music volume sound louder.I designed this in about 10 minutes on google sketchup to fit onto my iPhone 4s with my Speck Candyshell case on it on it (This is the first actual object I've ever made). My phone with the case on is about 14mm deep, so you can experiment to see if it fits with your phone case. When I have more time I plan on actually putting more work into this to make it look nicer, work more efficiently, and fit on an iPhone without a case. For now however, enjoy :)