The PRM-USTB is a professional multi-source music player intended to be used as background music source for public address and commercial audio applications. It has USB interface, SD card input for playing stored music files, tuner for FM frequency band broadcast receiver and Bluetooth receiver for direct music streaming from a mobile device. It is used in hotels, shops, supermarkets, restaurants, bars, canteens, gyms, showrooms, and other places where background music creates the right atmosphere.