JBL BassPro Go 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. It also has a convenient safety cover to help protect the speaker when used out of the vehicle and to provide an IPx5 marine rating.