Tweakers Mini-Boom Portable Speakers (BLUE) for Laptop, iPhone, MP3 Sound larger then can imagine would come out of this mini stereo speakers Powered by rechargeable battery. Lithium polymer battery comes with built-in retractable audio/charging cables. Plug into the headphone jack of your notebook computer or MP3 player to enjoy music and more. A pop-up chamber on each speaker offers richer bass, comes with Travel Pouch to protect item when traveling Speakers come in dual speaker configuration with stereo sound