The Anchor Audio BIG2-XU2 is a Bigfoot 2 portable sound system with built-in Bluetooth AIR wireless transmitter & dual wireless mic receiver. The Speaker Reaches crowds of 5,000+ with its 130 dB of clear sound and powerful 400W AC and 400W DC modes. The built-in rechargeable batteries operate 6 - 8 hours on a single charge. This unit features Five 8" neodymium woofers, one neodymium compression driver and two universal microphone input jacks. The BIG2-X comes with one built-in transmitter that wirelessly connects to one or more Bigfoot AIR receiver speakers and one built-in receiver that wirelessly connects to the Bigfoot AIR transmitting speaker.