... and fast,clear sound.Work as SD card. promotion usb 2.0 speaker(model :FS1001)Rated impedance: 4 EuroRated Power ... easy and fast4, pure, beautiful sound, mellow sound transparent, high clarity, electronic volume control5, low frequency booster smart design principles ... OEM service is offered and color can be choosed9, Packing : Gift box or on customer's request. protable USB Speaker/Promotion usb 2.0 ...