Sony SRS XB20 Buttons Explained: Summary The Sony SRS XB20 Bluetooth Extra Bass speaker has seven buttons across its top panel. E.g. Including the EXTRA BASS, PHONE-BATT, Play-Pause, ADD, Volume UP and DOWN, and Power-Pairing buttons. Knowing how to use these allows you to fully enjoy the many advanced features of this wireless speaker. So here … Continue reading Sony SRS XB20 Buttons Explained