The Music Streamer HD is an ultra high performance digital to analog converter (DAC) that connects a computer, tablet, smartphone or any compliant host and the analog inputs (balanced or unbalanced) of an audio system.USB connected and powered, the Music Streamer HD is simple to use and provides a level of performance that is unsurpassed at any price point. The Music Streamer HD approaches near theoretical limits for resolution and will astonish even the most demanding listener. With its high performance asynchronous USB transceiver, differential current mode conversion and a fully differential signal path, Music Streamer HD provides the perfect topology for ultra high resolution digital to analog conversion. All power requirements for the Music Streamer HD are supplied from the host, operation is simple, just plug into any available USB port and in a matter of seconds, you will be ready to experience a level of sound that will delight all. With its jitter free interface, the Music Streamer HD will transform your computer into a better than CD quality source. Utilizing native Audio Class 1.0 or 2.0 drivers (available in all modern PC, Mac & Linux computers), simply select the appropriate audio class via the Music Streamer HD's front panel switch, connect it to your computer via the included USB cable, connect the audio outputs to your audio system (RCA or XLR) and then select the Music Streamer HD as the audio destination on your computer. You are now ready to experience sound at its best. LED indicators show the current sample rate (44k1, 48k, 88k2, 96k, 176k4 & 192k), the bit depth (16 or 24) as well as the state of the mute circuit, so you will always know at a glance your system's operating mode. High Resolution Technologies' UpStream utility allows the Music Streamer HD's firmware to be updated right from the computer's desktop in a matter of seconds.