This HDMI Arc Audio Extractor & DAC audio converter can return the sound of a TV that supports ARC function to the adapter's ARC loop output interface, optical fiber,RCA and 3.5mm headphone jack output through the HDMI ARC interface of TV.and it can support optical and ARC output at the same time.HDMI ARC ,RCA and 3.5mm headphone output volume can be controlled by TV remote control (CEC).It also supports optical audio signal input,which is converted into RCA and 3.5mm headphone jack stereo analog signal. which perfectly solves the interface compatibility problem between the TV(with HDMI Arc interface) and the audio system.This product is very suitable for home theaters, teaching, training structures, conference rooms, home appliance stores and other places.