Ultra-Thin Travel Speaker Ultra-Think Speaker works with MP3 player, laptop and more-for great sound anywhere Lets you rest your MP3 player or other devices directly on the speaker to watch movies Packable and easy to carry, our Ultra-Thin Travel Speaker folds flat when not in use and fits neatly in your carry-on. Uses 3 AAA batteries (not included). the built-in 3.5mm audio jack eliminates cable mess. Great with your BlackBerry, iPod touch, iPhone and other handhelds. Also works with most laptops.