... USB speaker, PC portable mini speaker 1.Quality, innovative and portable 2.USB power supply 3.Line-in Mini portable amplifier speaker, PC ... portable mini speaker box, Technical parameterOutput power:3.0W, 4ΩSNR ... display2.Built-in FM radio3.Built-in rechargeable lithium battery4.With line in function, can switch-in Notebook PC, MP3, MP4 ...