LIBERTY WITH MP3 PLAYER INSTALLED. Perfect for outdoor and indoor events. Covers 2,000 people.AC powered. Built-in MP3 Player ? placed at the base of the enclosure. When it?s on the speaker stand, it?s at eye level. Reads WMA and MP3 files with slots for SD card and USB thumb drive. 10? neodymium driver provides increased dynamic range and it?s lightweight. USB charging port for iPod® or other music playing devices. Great for assemblies, graduations, presentations and any other activity indoor or out.