... the use of simple and low cost, schools, outdoor lectures, dance, gymnastics demonstrations, outdoor activities, hiking guide, street selling, the square ... as shopping malls to promote the supermarket is the best public address equipment users.Key Specifications/Special Features:1.receiver ... . main unit:200v ;100hz to16khz; inputs: wire mic*2,wireless mic *2 and auxiliary*1 guitar input*1 ;4. speaker ...