The portable bluetooth speaker designed with highly efficient drivers and dual passive bass radiators bring full, high-def sound. speaker includes 1200mAh Li-ion rechargeable battery. It has 48 hours stand-by time, supports memory card and U disk music,and also with radio function. Dual-diaphragm speaker design.Exhibiting a seamless fabric wrap and tactile controls, the bluetooth speaker is designed to stand out in any environment. Wirelessly streams stereo music from any bluetooth device.