Tendak HIFI 4 x 2 HDMI Matrix 4 input 2 output HDMI 1.4V Switch/Splitter SPDIF Digital Stereo Audio with IR Remote Control Supports 4K & 3D HIFI 4 x 2 HDMI Matrix with four HDMI inputs signal switch to two outputs HDMI sink devices Output A supports additional audio output through SPDIF (TOSLINK) and RCA R/L stereo audio HDMI 1.4 supports 1080P and 4K x 2K resolution & 3D; Supports 30/36/48-bit deep color, Blu-Ray 24/50/60fs/HD-DVD/xvYCC, and digital audio formats including DTS-HD/Dolby-TrueHD/LPCM7.1/DTS/Dolby-AC3/DSD RCP function: RCP function, it can do control to mobile device and matrix switch by the TV remote. (Mobile device should support RCP function and TV support CEC function) Audio sync separator output can be achieved with 2CH/5.1CH. There are ARC/ 2.0CH / 5.1CH three kinds of audio mode options; Only Output A supports ARC (Audio Return Channel)