Panlong HDMI ARC Adapter with CEC and Optical TOSLINK Audio Output One set of HDMI input and output, One ARC audio signal output (Toslink) HDMI output supports ARC (Audio Return Channel) for old receivers that do not support ARC HDMI supports up to UltraHD 4K x 2K resolution. Supports CEC function ARC on/off switch and indicator let you know if ARC is disabled or enabled Plug and plug. DOES NOT extract audio from HDMI input to Optical out. Optical will work only at ARC mode (extracting audio from TV's HDMI ARC port.)