This Swiss-designed DrumBass™ II Extendable Speaker features twist technology with an improved, extendable drum-shaped sound system for superior audio quality. It is rechargeable via USB and boasts up to 9 hours of incredibly stunning sound. Additional speakers may be added for an even greater sound experience. Works with iPod®, iPhone®, iPad®, computers and most smartphones or other portable devices with a 3.5mm audio port. Exclusive storage case, audio cable and charging cable included. 1 year international warranty.