Tendak Digital to Analog Converter Portable DAC Headphone Amplifier AMP Support Coaxial/ Toslink / SPDIF / Optical to 3.5mm & Analog L/R Audio Digital to Analog Converter can converts a digital coaxial/optical S/PDIF signal to two-channel L/R and 3.5mm headphone analog audio output, with Select button to choose the input signa(coaxial or toslink) Portable headphone amplifier supports sample rates including 32KHz, 44.1KHz, 48KHz, 96KHz, 192KHz, up to 24-bit resolution. The digital analog converter only supports 2-channel PCM audio signals and does not support Dolby, DTS, or other multichannel compressed audio formats.NOTE that NOT supports 5.1 channel. Press the knob once to select which audio source (SPDIF/Coaxial) will be input; Spin the knob on the left of earphone amplifier to up/down the volume This digital analog adapter compatible with televisions and Apple TV/CD/DVD/Blu-ray players/cable box/computer/HD game console/media player/set-top box/Smart TV with S/DIF digital output.