... .1 audio Speaker D0380 Low frequency sound have power, feel warmly Audio signal cable connect to PC, notebook, DVD player, cellphone, MP3 player etc ... audio outputUSB cable connect to PC, notebook, DVD player etc. USB port (USB 5 ... %,f=1KHz3. Impedance: 4 4. F.Response 150Hz-20KHz 5. Speaker unit: 2*26. SNR: >= 80 dB7. Power: DC 5 V ...