Accepts uncompressed digital audio input source signals. 24-bit S/PDIF incoming bitstream on left and right channels. 4: HD820 Support Bluetooth 5.0 audio receiver. Ability to switch between coaxial and optical audio input connections. 3: All signal source(HDMI/ARC/COXIAL/OPTICAL/PC-USB/USB) can decode to 5.1ch output,it is audio decoder system.