The Kama Bay AMP 2000 Rev.B Class D amplifier can be used with common passive speakers. Thanks to its high versatility it is possible to use the Kama Bay AMP 2000 Rev.B inside a vacant 5.25" PC case bay or externally as a stand-alone device. Users can switch between a total of 4 input sources and charge their MP3 player at the same time by using the built-in USB connector. New INPUT/OUTPUT selector switch added.