Portable speakers P-18 are designed for use with iPod, MP3, CD, DVD and other portable players and notebook computers. Speakers offer a foldable and compact design, built-in digital amplifier, neodymium magnet speaker and patented reflecting panel structure. Acoustic speaker cabinet provides optimal base sound. Power via USB cable, AC adapter (sold separately), or AA batteries (sold separately). More than 40 hours battery life. Includes USB power cable and 3.5mm to 3.5mm audio cable.