*USB port, no sound card and power supply required, plug and play in WinME,2000,XP *Various colors: Silver,Black,Blue,Gold,Pink,etc *Excellent plastic housing,Smart & unique design,perfect companion of lap-top and desktop Product Specification/Models *RMS:3W*2 *P.M.P.O:150W *Driver Unit: 2*1 *Impedance: 4 Ohm *Frequency Response: 200HZ~18K HZ *S/N:>65dB Other Information Email: MSN: Tel: +86-755-29950835 Fax: +86-755-29950853 Website: