This revolutionary. multi-function backpack takes your tunes into the future. Through mind-blowing technology and an ultra-thin NXT internal speaker. you can listen to your iPod privately through headset. while having full control of your iPod through the 5-button system located on the back strap. or play your tunes loudly though the speaker. by connecting your iPod. mp3 or other audio device. Now you'll never need to carry extra speakers while traveling! This bold blend of 420 rip-stop and 1680d ballistic nylon also boasts a laptop compartment. four side zip pockets and many more pockets for your phone. PDA. wallet. cards. pens. keys and water bottle. Plush padding in back makes carrying a pleasure. Speaker requires 3 AA batteries. not included.