... usb fm audio speaker for mp3 phone 1.clear alt&pure woof 2.Connect usb,tf card,phone,computer,mp3 3.LCD screen&FM mini speaker ... for mp3New mini aluminum vibration film loud speaker ... music,connecting your mp3, mp4,mobile phone,notebook computer,U disk and SD ... response:150-18000Hz(3dB)SNR:≥80dBALoud speaker: 1.77”(OD 45mm),magnetless,4 ...