Mini speaker, mobile phone speaker 1,DC 5V 2.USB power 3.RMS:6W Mini speaker, plastic speaker, mp3 speaker, multimedia ... : 3Wx2 6. Frequency response: 200-18kHz7. Impandence: 4 ohms8. Input power: DC 5VWe got the FCC, CE, ROHS and other international ... no best only better, so our products are more competitive mobile phone speaker