We're the professional manufacturer of computer accessories such as mouse, keyboard, speakers, webcameras, USB Flash Drive and so on. And we often develop some new models and open the modules by ourselves, so the price and quality are all competitive. Kindly welcome to contact and inquiry me for more information if you're interested in them, thank you! We'll certainly try our best to offer you best price and good quallity, sincerely looking forward to your inquiry and having the opportunity to cooperate with you! Genereal Introduction: R.M.S: 0.5W*2 Drive Unit Full Range: 2.25" IC: NO IC Power: AC power Rated Impedance: 4ohm Frequence Response: 20Hz-20KHz Separation: >=45dB S/N Ratio: >=50dB THD: <=0.5%