The HDA-929 4K HDMI ARC/eARC Audio Adapter is capable to output Dolby Atmos audio from an external HDMI source to eARC/ARC sound systems. Since it is compliant with audio formats such as LPCM, Dolby True HD and DTS-HD Master Audio, this adapter is a perfect solution for connecting SONOS ARC/BOSE 500/BOSE 700/ BOSE 900 Soundbars and other eARC/ARC audio/video receivers. It also provides a dedicated HDMI output port for outputing audio only when connecting with legacy AVR without eARC/ARC function. Surge protection device This product contains sensitive electrical components that may be damaged by electrical spikes, surges, electric shock, lightning strikes, etc. Use of surge protection systems is highly recommended in order to protect and extend the service life of your equipment. For any technical issues, please refer to page 3 of the manual for detailed guidance. NOTE: Does NOT work with eARC Soundbars like Sonos and Bose. Use BK-929 for eARC Soundbars