... gift, hotsale item Private mould Fashion shape Real factory Portable Mini USB2.0 PC Speaker System/mini stereo/laptop , ... speakers utilize the advanced technology with class-D digital power amplifier, able to perform high efficiency, low distortion-rate and ... Laptop, PC, MP4, MP3, PDA, Home Theater, subwoofer speaker ,Portable Audio Player, Mobile PhoneSNR: 65db, Isolated rate: 40dB, Frequency: 180HZ ...