The body pack is a small electronic device that needs to be carried by a performer in a wireless system. Its function is mainly to send a sound signal to a remote receiver. Of course, it can also be used to receive remote signals in a personal wireless monitoring system. The structure of such a device is usually very simple, consisting mainly of electronic components and a battery dedicated to transmitting, receiving or amplifying signals. Nowadays, some wireless systems have begun to build the internal components of such devices directly into the microphone or can be directly inserted into the small plug of the guitar or other instruments, thus eliminating the need for the performers to carry around.
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