1.[Unique Optical to HDMI ARC Conversion]Unlike most converters on the market, this adapter supports converting Optical SPDIF input to HDMI ARC output, making it fully compatible with Sonos soundbars and other advanced audio systems. 2.[ARC Audio Extractor & DAC Converter]Supports HDMI ARC, optical SPDIF input methods with an easy-to-use switch for selecting inputs. Converts digital Optical SPDIF audio to analog RCA/3.5mm output, ideal for HDTV, HD DVDs, and home theater systems. 3.[ARC to Optical SPDIF/Coaxial/RCA/AUX Mode] When using ARC, first set the device to ARC mode and connect it to your TV's HDMI ARC port. This allows the TV's audio signal to be output to hdmi ARC, optical, RCA L/R, and 3.5mm headphone interfaces. 4.[DAC Digital to Analog Audio Converter Mode] To use as a digital-to-analog converter, set the input mode to optical, and connect to the TV or streaming device's Optical SPDIF output port. This converts digital audio signals into analog stereo audio. 5.[TV Settings for ARC mode]1) Ensure your TV has an HDMI port labeled 'ARC'; 2) Go to the TV menu settings, turn on CEC, then set the audio output to HDMI (ARC), and finally set the audio output format to PCM, LPCM, or Source for optimal performance. 6.[Volume Control Feature in ARC mode] You can use your TV remote to adjust the sound volume when using the ARC input with the RCA L/R or 3.5mm output. Note: The TV remote cannot control the volume of coaxial or optical outputs, and volume control is not supported for optical SPDIF or coaxial inputs. 7.[192KHz High Sampling Rate]With a 192KHz high sampling rate, this HDMI ARC converter guarantees pure and lossless audio quality. It seamlessly connects your TV to your soundbar a/v receiver amplifier, making the HDMI ARC adapter an indispensable upgrade for your home entertainment system. Note: Soundbars with HDMI-only input are not supported. 8.[Wide Compatibility]This HDMI ARC to Optical Audio Adapter is widely compatible with various TV brands with HDMI ARC port, Optical SPDIF or Coaxial port, such as Sony TV, Samsung TV, LG TV, Fire TV, Roku TV, etc.