AN-Mini speaker monitor with one wireless receiver is most powerful, smallest system on the market. It is compact, lightweight and you can take it anywhere. It includes one built-in wireless receiver, and delivers a powerful clear sound, and will project clear, intelligible speech. It is battery powered and runs for up to 12 hours on a full charge. Just switch it on and you are ready for any indoor or outdoor assemblies. You can also connect your iPod, MP3 player or CD player to the AN-Mini. Perfect for any school event, classroom, conference room or cheer squad.