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 (can output sound at the same time) through the -compatible ARC interface. It also supports conversion of digital audio fiber or coaxial signals to analog stereo signals. Features: 1. -compatible ARC, You need to use a standard -compatible cable to output the TV's sound to the optical fiber, coaxial, R/ L, 3.5 mm headphone through the -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 function of the TV) Specifications: Colour: Black Material: Aluminum Alloy Power Supply Interface: -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 that the TV has an -compatible "ARC" interface, and only supports with -compatible ARC function. 2. Please set the audio output to or LPCM using -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 / . ) 3. Please turn on the 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 -compatible cable to support ARC function 5. Connect different audio interface inputs, please select the corresponding input switch. Package Contents: 1 x ARC Audio 1 x USB Cable 1 x English manual Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.