X-Mini XAM16-B ME Portable Speaker (Black) Super portability - loop a lanyard or keychain around the metal bar and bring it everywhere you go. Includes a mini-USB to 3.5 mm adapter cable assembly. Impressive playback time - Up to 6 hours of playback with easy Micro-USB charging Compatibility - Best used with smartphones, tablets and portable game players. Simply plug and play your favorite tunes. Sound well beyond its tiny size!