1)2.0 usb mini speaker 2)Carry-home,plug and play 3)Can also be prowerd by PC, 4)Up to 10hs playing time(medium volum 1) 2.0 usb mini speaker 2)Carry-home,plug and play 3)Can also be prowerd by PC4)Loudspeaker output:2WFeatures:Stereo systemsAudio with high fidelityPowered by separate build-in rechargeable batteriesAbout 3-4 hour continuous playback time (medium volume, random music) Each speaker ...