... Real factory Portable Mini USB2.0 PC Speaker System/mini stereo/laptop , subwoofer speaker ,vibration speakers systemSpecificationsIt is well suitable ... providing high efficiency, low distortion-rate and clear soundChannels:2.0, Type: Wired, USB 5-6V Power supplySuitable ... for Laptop, PC, MP4, MP3, PDA, Home Theater, subwoofer speaker ,Portable Audio Player, Mobile PhoneSNR: 65db, Isolated rate: 40dB ...