Product Features: Input interface: eARC/ARC(Make sure the eARC/ARC function is turned on before use.) Output interface: HDMI1,fiber optic1,RCA2,3.5mm1 Supported audio formats: PCM, AC3, DTS, DD+ DTS-HD Master audio, DOLBY True HD Power interface: DC5.5V/300mA,Please use 5V 1A plug Product Specifications: Supports eARC and ARC inputs HDMI,fiber optic,RCA,and 3.5mm headphone outputs(HDMI only transmits audio signals and no images) HDMI output supports up to HD 5.1 and HD 7.1 channels. Fiber optic interface supports up to 5.1 channels Supports transmission of 24bit/192KHz audio sampling rate RCA and 3.5mm headphone output volume can be controlled by TV remote control(CEC) Note: 1. When there is no sound output from the device after turning on the power, please check the following problems: A: Does the TV support eARC/ARC function B: Whether the adapter is turned on C: Whether the HDMI cable is connected to the TV support HDMI eARC/ARC interface D: Whether the TV is in HDMI eARC/ARC audio output (use the TV's remote control to turn it on). 2. When the RCA connector, headphone jack, is noisy or abnormal, set the TV to stereo output (PCM/LPCM 2-channel output). 3.:Please connect the HDMI port with the eARC/ARC mark and make sure the eARC/ARC function is enabled on your TV, otherwise it cannot be used. Package Include: 1xAudio Extractor Adapter 1xUSB Power Supply Cable 1xUser Manual