3 MODE- Mode Pass: HDMI to HDMI; 2.1CH mode: HDMI to 2.1CH R/L RCA; 5.1CH mode: HDMI to SPDIF / 5.1CH Optical. Note: you cannot use the TV's HDMI port as the sourceAudio HDMI Extractor - It converts 4K HDMI digital signal to 4K HDMI display. Digital and analog audio interface with 3.5mm optical and audio jack for your audio system and earphone. Note: HDMI source devices do not support TV's HDMI interface. Once connected, volume control is not supported.COMPATIBILITY - This HDMI Converter can be Used to Convert Digital Audio Signal to Analog Audio Video Signal via HDMI Input and HDMI and RCA L/R and SPDIF Output, which is Suitable for Blu-ray/DVD/HD Player, Cable/Satellite Box, HDTV, PS3/4, Xbox, PC/Laptop, HD Camera, HD DVR, etc. Note: Different output methods support different audio output formats. Please follow the instructions.METALLIC ALUMINUM - Aluminum Alloy Enclosure with Gold Plated HDMI Plugs Provides Good Anti-Interference and Makes Sound Pure and Clear.PACKAGE - Includes 1 x HDMI Audio Extractor, 1 Micro USB Cable, 1 User Manual.Note: The data is all manual measurement, please allow 1-3cm error; due to of the light and display difference, there would be a certain color difference, please refer to the actual object received.