**********Optical Audio Switcher 4x1 Four ways of optical fiber signals switch to one sets of SPDIF/TosLink signal receiving device. *****Support Audio Format LPCM 2.0 /DTS/Dolby-AC3, 96Khz, It does not support 7.1CH Dolby Digital Plus, Dolby TrueHD, because 7.1CH audio cannot be transmitted via fiber optic cable and must be transmitted over HDMI cable. *****Long distance signal transmission Used optical fiber cable loss less the 0.2D b/m, Output distance is up to 40m/130ft. *****Voltage ProtectionOver-voltage protection can prevent the damage caused by connecting unmatched power adapter to the machine. *****High-grade Aluminum Alloy Design Overall Shielding without Signal Interference, Ensure high-quality audio signal to send