JBL Micro Wireless Ultra-Portable Speaker, Black Bluetooth streaming wirelessly streams high-quality stereo music from any Bluetooth-equipped device Built-in bass port generates impressive bass for its size and bass thats superior to comparable portable products Built-in Li-ion rechargeable battery that provides up to five hours of playback time and can easily be recharged using the included adapter Smart Cable design stores in the bottom of the speaker case to prevent tangling Chain multiple Micro Wireless speakers together to create a truly impressive sound environment