portable mini spealer,Material:metal,perfect sound. apply to mobile phone,MP3,MP4,PC and other audio output devices. TF card ... .Can be connected to the mobile phone, MP3, MP4, the PC and other audio output devices. Output power: RMS 3Wx2 THD = 10%;Frequency ... .5cmGW / NW: 21.5/20.5KGSAccessories: USB cable, audio cable Portable Stereo speaker mobile phone, MP3, etc