Mr. Simo, whoever you are, you are a bad man. This from the site:
"The Self Powered, Portable Suitcase Stereo system works with your iPod/iPhone or any device with a headphone jack. This case will last 7+ hours on a single charge (Charger Built In). In addition to running on batteries, The BoomCase can also be plugged in when the party goes inside. To save on weight, you can opt for a plug-in only version."