All About Your RDAC5 (RDAC5B, RDAC5S): HOW TO Set Up Your RDAC5: What's In The Box: DAC with built in headphone amplifier USB interface cable Power adapter How to instructional setup video Warranty card How-To instructional video Features: Rockville RDAC5 DAC Digital To Analog Converter USB/Optical/RCA/Headphone Amp Converts digital audio to analog Converts computer USB playback to RCA Can also convert optical or Coaxial to RCA 24 bit / 192Khz high resolution lossless audio USB Audio playback Optical Input Coax input RCA Output Supports virtually all digital file formats including top quality 24-bit high resolution or lossless audio files stored on your computer Unique compact design You can connect your computer to the DAC through the included USB interface cable You can connect your TV to the DAC through optical You can connect the DAC to your receiver or amplifier or powered speakers through RCA Built in headphone amplifier drives high impedance headphones Headphone monitor volume control Headphone output and speaker output works simultaneously Plug and play into your computer (no downloads or extra drivers required) and select the bit depth and sampling frequency within your computer Great sound quality and performance Perfect for music playback, video games, or home theater systems Incredible Frequency Response: 5hz To 48khz (±0.1db) Thd @ 1khz 0dbfs: