BEACON-7500MU2 WITH 2 COLLAR MICS. W/BODYPACKS. Great for large outdoor events, covers 4,000 people, battery powered so it can go anywhere. Sets up in seconds and has wheels so you can roll it away. No need for a speaker stand this unit stands 6ft tall on its own and then folds down to a height of 2.5ft. Built-in MP3 Player - reads WMA (Windows Media file) and MP3 files with slots for SD card and USB thumb drive. Built in wireless receiver. Perfect for assemblies, picnics, sporting events and more.