Check out the Mipro family of portable, battery-powered, wireless PA systems!
Mipro Portable PA Systems
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EVENTS:

 

NAB Expo
Las Vegas Convention Center, Las Vegas, Nevada
April 16-19, 2012
http://www.nabshow.com/2012/default.asp

InfoComm
Las Vegas Convention Center, Las Vegas, Nevada
June 13-15, 2012
www.infocommshow.org