Overview: Supports PC-to-PCand PC-to-phonecalls Compatiblewith USB1.1and USB2.0interface Nosound, noexternalpowersupply; Effectiveechocancellation, noisereduction Withlaptopcomputers, portabledesign Frequencyrange:20-20000 Hz Sensitivity:111d B±3% Impedance:150ohm Speakerdiameter:38mm Cordlength:2m Specification: Weight Approx:192g Size Approx:21 x 6.2 x 6.8