The JBL BassPro Go Portable Subwoofer & Bluetooth Speaker is a powered subwoofer designed to easily mount & charge in any vehicle, augmenting the output of full-range speakers at the lowest frequencies, with quick disconnect features to become a portable Bluetooth speaker and keep the party on the go. With convenient and easy to use controls in or out of the vehicle, BassPro Go allows you to dial in your music exactly the way you want to hear it.