Sony XB30 Extra Bass Portable Bluetooth Speaker. Built tough, this IPX5 water resistant speaker lets you listen to your music by the pool, at the beach, and more. The Sony XB30 Extra Bass Portable Bluetooth Speaker has dual passive radiators and a 48mm full-range speaker setup to deliver clear sound while enhancing low notes. For added bass power, just hit the EXTRA BASS button. Equipped with a multi coloured line light and flashing strobe, the portable speaker can quickly improve the party atmosphere.