Get the party started with the egroove 21 subwoofer speakerr connect directly to your usb device bluetooth system or sd cardsr generous battery life provides 4 to 6 hours of uninterrupted user can also connect to a tv or multimedia device via an audio jackr curvaceous modern design that looks great in the home or officer features an amplified subwoofer for a better listening experiencer see full details for specificationsr save 19 on the egroove 21 subwoofer speak