White Label RockPro mini Bluetooth Speaker with Super Bass, Portable Subwoofer wireless Speaker for Desktop Office, 6 Hours Battery Life (White) BUILD-IN 3 SPEAKER UNITS give you a best rated bass at this cost level TOP RATED LANG RANGE CONNECTION,up to 30 feet and always in smooth speed COMPACT COBBLESTONE SHAPE make it portable and rugged BUILD-IN 3.5mm AUDIO JACK, special for those non bluetooth device and low battery ENJOY the high quantity subwoofer at anywhere by this tiny speaker