Here is another simple speaker that’s perfect for traveling. Tiny but functional, the Keychain Mini Speaker is only a 1-inch cube, but still manages to have a decent sound and a 3.5mm audio out socket to plug into your MP3 player, PDA, laptop or portable gaming system. With a USB connection you can recharge its built-in battery. Available in either silver or black, after the $20.07 price, all you need to add is the iPod.