Here’s one of the most compact portable speaker that has just caught my attention on account of its expandable chamber that amplifies the sound by sound resonation. It’s good to have one of these with you when going on a trip. When you’re done listening to the music, just pack it, stick it in one your bag’s compartments and move on to. You can plug it in your iPod or cell phone and is able to offer only 2.4W for 6 to 8 hours, based on a 4 hours charge …