3 MODE - Pass Mode: 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 HDMI port of the TV as the source. Support work in RGB modeHDMI Audio 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. After connection is established, 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 Output and RCA L / R and SPDIF, 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.METAL ALUMINUM - Aluminum Alloy Housing with Gold Plated HDMI Sockets Provides Good Anti-Interference and Makes Sound Pure and Clear.PACKAGE --- Includes 1 x HDMI Audio Extractor, 1 x 3.5mm RCA to RCA Stereo Audio Cable, 1 Micro USB Cable, 1 User Manual.Note: When using Firestick, you cannot connect it directly to the HDMI port of the product.Please use the HDMI adapter cable included in Firestick to connect Firestick and the product separately.