1. HDMI ARC, you need to use a standard HDMI cable to output the sound of the TV to the optical fiber, coaxial, R/L, 3.5mm headphone jack through the HDMI ARC interface (the sound can be output 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)Product name: ARC audio extractorPower interface: Micro-USBMaximum working current: 100mAWorking environment temperature: -10~+55℃Storage temperature: -20~+60℃Working humidity: 10~90%RH (non-condensing)Storage humidity: 5~95%RH (no condensation)Weight: 120gcaution:1. Make sure that the TV has an HDMI "ARC" interface and only supports TVs with HDMI ARC function.2. Please set the audio output to PCM or LPCM before using HDMI ARC. (When the output audio is 3.5mm AUX stereo or L/R RCA, the output of the audio source needs to be set 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 interface.)4. Please use standard 19+1 HDMI cable to support ARC function5. To connect different audio interface inputs, please select the corresponding input switch.Colour: blackMaterial: metal + plasticPackage Contents:1 x audio adapter1 x USB cable1 x English manualOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.