-USB bus powered -Linear PCM audio up to 24-bit/192 kHz and DSD audio up to 5.6 MHz playback -High-resolution playback in combination with "FOSTEX Audio Player" software -HI/LO Gain selection (10 dB) -Asynchronous transfer mode using custom-made crystal -Digital filter with selectable roll-off and cut-off characteristics -Complies with USB Audio Class 2.0 on Windows XP (SP2 or later), Vista, 7, 8 and Mac OS X 10.6 or later -microSD (SDHC) . . .

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-USB bus powered
-Linear PCM audio up to 24-bit/192 kHz and DSD audio up to 5.6 MHz playback
-High-resolution playback in combination with “FOSTEX Audio Player” software
-HI/LO Gain selection (10 dB)
-Asynchronous transfer mode using custom-made crystal
-Digital filter with selectable roll-off and cut-off characteristics
-Complies with USB Audio Class 2.0 on Windows XP (SP2 or later), Vista, 7, 8 and Mac OS X 10.6 or later
-microSD (SDHC) card drive on the rear panel for future firmware updates

http://www.fostexinternational.com/docs/products/HP-A4.shtml

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