How Do These Sound Boxes Make Sound?

[farawayfromhome]

I'm an iPhoner 4 and looking for a speaker for my phone. I found a type(http://www.tinydeal.com/apple+Mini+USB+Powered+Vibrating+Audio+Resonance+S peaker234 and http://www.tinydeal.com/apple+Mini+USB+Powered+Vibrating+Audio+Resonance+S peaker172) online yesterday. They are shaped like apples and their brand name starts with an "i" -- obviously to cater for iPhoners. But i've found no hole on the small sound boxes, so I wonder where sound is sent out. Anyone tell me about the stuffs?

 

[Miggs2002]

speakers are so technically advanced these days, i saw somewhere on the net once some suckers that go onto a window, you then connect them with a jack plug to a music source and the window becomes the speaker

cool

 

[farawayfromhome]

But what kind of surface or panel best realize its function?