portable wireless amplifierHigh quality Lithium battery portable voice amplifier , ... use of simple and low cost, schools, outdoor lectures, dance, gymnastics demonstrations, outdoor activities, hiking guide, street selling, the square ... main unit:200v ;100hz to16khz; inputs: wire mic*2,wireless mic *2 and auxiliary*1 guitar input*1 ;4. ... Gift box: 1 piece Adaptor:: 1 piece portable wireless amplifier