The PA40BATBT Battery Powered 40-Watt P.A. System is a portable all-in-one package that combines quality performance and convenient features. Similar in design to our popular PA50 and PA100 P.A. Systems, the PA40 stands alone because the controls have been moved to the front of the unit for easy accessibility. With a built-in rechargable battery and portable design, the PA40 allows you to take your music anywhere you need it. The PA40BATBT Battery Powered 40-Watt P.A. System is a portable all-in-one package that combines quality performance and convenient features. Similar in design to our popular PA50 and PA100 P.A. Systems, the PA40 stands alone because the controls have been moved to the front of the unit for easy accessibility. With a built-in rechargable battery and portable design, the PA40 allows you to take your music anywhere you need it. The PA40BATBT features 2 channels controlled by a Master Level Control. The first channel incorporates both a XLR microphone input and a line level input. The second channel consists of an auxiliary input and line level input. Both channels have individual high and low EQ controls and a volume control knob. All four inputs can be used simultaneously. The PA40BATBT has a built-in rechargable battery so you can play 10 hours of uninterrupted music, or if AC power is available plug-in directly. The Powerlink Circuit allows two or more units to be linked together and function as one P.A. system. So as your sound needs to grow, your sound system can grow with them. Multiple units can be connected to increase the sound coverage in your venue of choice.