• The HP Thin USB (Universal Serial Bus) Powered Speakers produce a rich high quality sound that provides an excellent stereo speaker solution for business users. • Speaker uses one USB (Universal Serial Bus) port from the connected PC to power the speakers so that no external power adapter is needed • Power & volume knob is conveniently located on the side of the right speaker, to control the volume without fumbling through PC software • Headset connection on the side of the right speaker