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It definitely is not self powered by batteries but they may have meant that it does not need a wall outlet as it runs off the laptop battery. One option you could do is get a small power pack with USB ports (usually used for cell phone charging or similar devices) and this would free up your single USB slot and keep your laptop charged up longer.
I would recommend:
Sorry, there was a problem. Please try again later.WorkEZ Cool includes 2 cooling fans and 3 USB ports. This fan/hub unit obtains power from an external source such as a laptop or battery pack (via an included cable). No batteries are needed or included.
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