This mixing amplifier is rated at 250W and 4-16 Ω speaker output are provided. There are 4 unbalanced microphones inputs and 3 aux inputs. Bass and treble controls 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 quiet sound system. It's also called pa mixer amp for shor