Overview: TheHDMI-compatible audio return and digital-to-analog audio converter can output the TV's sound to the optical fiber coaxial 3.5mm coaxial headphone jack (can output sound at the same time) through the HDMI-compatible ARC interface. It also supports conversion of digital audio fiber or coaxial signals to analog stereo signals. Features: 1. HDMI-compatible ARC, You need to use a standard HDMI-compatible cable to output the TV's sound to the optical fiber, coaxial, R/ L, 3.5 mm headphone jack through the HDMI-compatible ARC interface (can output sound at the same time) 2. Digital to Analog Audio Converter, You can also use digital audio coaxial and optical ports as signal source input to convert to analog audio R / L, 3.5mm output. 3. Support Remote Volume Control.When using the TV's ARC function, you can use the TV's remote control to control the volume. (Only supports RCA (left / right) and 3.5mm output interface, please turn on the CEC function of the TV)<br><br>Specifications: Colour: Black Material: Aluminum Alloy Power Supply Interface: Micro-USB Maximum operating current: 100mA Working environment temperature: -10~+55℃ Storage temperature: -20~+60℃ Operating Humidity: 10~90%RH(non-condensing) Storage humidity: 5~95%RH (non-condensing) Case size: 90 x 73 x 21 (mm) Weight: 92g Please Note: 1. Make sure that the TV has an HDMI-compatible "ARC" interface, and only supports TVs with HDMI-compatible ARC function. 2. Please set the audio output to PCM or LPCM before using HDMI-compatible ARC.(When the output audio is 3.5mm AUX stereo or L / R RCA, you need to set the output of the audio source to LPCM / PCM format. ) 3. Please turn on the CEC function of the TV so that you can control the volume. (Only supports RCAL / R and 3.5mm output interfaces.) 4. Please usestandard 19 + 1 HDMI-compatible cable to support ARC function 5. Connect different audio inter