OPTICAL AUDIO SWITCH 3X1 - Switches three ways of optic fiber signals into one set of SPDIF/TosLink signals. AUDIO FORMATS SUPPORT - Supports Dolby Digital & DTS 5.1, Support PCM Stereo 32kHz, 44.1kHz, 48kHz and 96kHz; Plug & play. LONG DISTANCE SIGNAL TRANSMISSION - Supports 5.1 channels output up 130 ft; Input can be selected with a remote control or by pressing a switch button. (Remote control battery not included). SAFETY PROTECTION - Over-voltage protection can prevent the damage caused by connecting an unmatched power adapter to the machine; WARNING: Please pull out isolation plastic in the remote before first time use.