Imagine how you could reach or talk to a lot of people without them hearing what you have to say? What will be the impact if statesmen or leaders on a big crowd were never understood despite their attempt to be heard. Worry no more because thats exactly what portable pa systems do. They amplify the sound without altering or changing the quality of the voice. They allow a bigger audience to be able to listen to a single person. The device comes with an amplification unit, a speaker unit and a microphone. You can buy additional effects or sounds individually. The quality of the sound will depends on the quality of the speaker. Since the system has other parts, if you buy one part that is not working properly then the whole unit will be affected, even the quality of the sound. For a better sound output, choose the best PA systems in the market.