his mixing amplifier is rated at 120W. 100V and 4-16 Ω speaker output are provided. There are 4 microphones inputs and 3 line inputs, FM, USB, SD audio sources. Bass and treble controls and master volume control are provided. This amplifier can be applied to different occasions, such as supermarket, classroom, etc. Extensive protection from short-circuit, overload and high temp is ensured. Automatic cooling system ensures the extreme quite sound system.