Hello Kitty KT4557MBY Bluetooth Speaker System Bluetooth 2.0 technology Powerful 4W amplified speaker Aux input jack (3.5mm) and audio cable to allow connection of auxiliary audio sources such as a computer, CD player or digital audio player USB port for charging the battery of your portable device 2.4GHz wireless frequency rate; AC operation: 100-240V, 50-60 Hz (AC adapter included))