It is not only compactable and portable product can easily be connected with a headphone use as a USB Soundcard as well as connect to the amplifier morever can be used as an integrated Soundcard as a computer upgrated products. The primary purpose is to create a high quality S/PDIF digital audio output signal that can be connected with your existing DAC. It also has a convenient headphone output for private listening.Muse DAC is powered by the USB cable, so there are no wall-warts or batteries to worry about. Use it standalone or build right into your DAC. Operation and setup is usually plug-and-play, no drivers is needed to install. Muse DAC provides the easiest way to convert your PC into a hi-end music server. Join the hundreds who have already upgraded. Once you get used to playing CDs from your computer, you"ll never want to go back to a traditional transport.This unit is compatible with both Windows XP and Mac OS-X. For best playback in Windows we recommend the driver from www.usb-audio.com and a player such as foobar2000 or Winamp.All components assamblied in this unit are produced by a fever-level components, the resistance to the Japanese KOA colored ring precision resistors, electrolytic capacitors are audio-specific fever ELNA capacitors, non-polar capacitors for Siemens MKT series, analog output, and gold-plated coaxial output port, the first use of optical fiber The protective door with automatic model, the use of more convenient.