Sony SRS-T88 Compact Portable Speakers Single chassis, dual speakers with 2 watts per channel Compact, foldable design permits easy transport wherever you take your portable music player or digital voice recorder 1.3-inch neodymium-magnet drivers produce high energy output for greater speaker movement, power, and sonic accuracy Magnetically shielded so the speakers will not disturb images when close to a TV or monitor Includes world-voltage (100V to 240V) AC/DC power adapter; also runs on 4 AA batteries (not included)