... x2 4. Speaker for laptop,mobile,mp3 etc Hot portable usb mini speakerSpecification1.Built-in recharheable lithium battery NOKIA 5C. Power Supply ... :110V~240V;DC out put:5V2.Support interface: TF card, USB disk, Aux in3.Play format: MP34.S/N: >85dB, ... 4hrsTechnical parameterOutput power:RMS 3Wx2Frequency:90Hz-20KHzDriver unit:36mmPower Voltage:USB 5VPacking detailsEach per PVC tray,then put in color ...