From formal events to casual gatherings, a battery powered PA speaker is a versatile self-contained auditory system that is easy to carry. Together with the power amplifier, the speakers form a single unit that is straightforward to use and portable. Moreover speakers of this kind are popular for public events, like street performances, community gatherings, weddings and other ceremonies, where power sockets are difficult to reach. These devices are made in such a way that the battery enables several hours of continuous use, although various other factors can affect battery life. This speaker is designed with a number of input channels so microphones, instruments and all sorts of other audio devices can be connected simultaneously. Many of them can control the sound and alter the way it is tailored for a certain place or occasion using the equalization effects provided.