1. There is a power switch on the volume knob, please turn on the power switch before using the DAC.2. Please set the Audio Output to the PCM/LPCM Format.3. For Samsung TV, if there is no sound even you set the audio output to the PCM/LPCM format, please turn ON the TV external speakers (Menus-Sounds- Speaker Setup- HESB/external speaker-ON)4. This converter doesn't Support 5.1 Channel Such As Dolby and DTS.5. PS4 Pro and PS4 Slim CANNOT use this converter as they haven't Optical fiber output interface.Product Specification:Type Audio Adapter/Converter Material Aluminum Input interface Toslink, Coaxial Output interface R/L RCA, Toslink, Coaxial, 3.5mm Signal Sampling Rate 32-192 KHz, Bit Rate 16-24 Bit Output Impedance 16-300 ohm Working Voltage 5V