Optical Audio Switcher 4x1:Four ways of optical fiber signals switch to one sets of SPDIF/TosLink signal receiving device Support Audio Format:LPCM2.0/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 0.2Db/m, Output distance is up to 40m/130ft Voltage Protection:Over-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