Three ways of optical fiber signals switch to one sets of SPDIF/TosLink signal receiving device. Audio format support : LPCM2.0/DTS/Dolby-AC3. Support signal retiming. Used optical fiber cable loss less the 0.2Db/m, Output distance is up to 40m. The input control can through R/M and also can directly press the button. Support last time working state memory when power off.