Peachtree Audio X1 Asynchronous 24/192 USB to SPDIF Converter Converts a computer's USB output to a Coaxial or Optical digital audio signal Supports up to 24 bit/192 kHZ resolution audio signals Asynchronous USB circuitry for low jitter No power supply required- operates off of the USB port of your computer USB 2.0 compliant- works with both PCs and Macs (driver required for use with Windows PC)