Music mini usb fm audio speaker for mp3 phone 1.clear alt&pure woof 2.Connect usb,tf card,phone,computer,mp3 3.LCD screen ... ,mobile phone,notebook computer,U disk and SD card more.metallic,shell shows noble and fashionable,out of ordinary,with many colours ... ,4ΩPower supply: DC 5V(Inner+ outer-),USB power rotate connect line(can choice)Line in: configure 3.5mm stereo's plugs