1.Four ways of optical fiber signal input split or switch to four sets of SPDIF/TosLink signal receiving device. 2.Audio format support : LPCM2.0/DTS/Dolby-AC3 3.Support signal retiming 4.Used optical fiber cable loss less the 0.2Db/m, Output distance is up to 30m. 5.The input control can through R/M and also can directly press the button. 6.Support last time working state memory when power off. 7.Over-voltage protection can prevent the damage caused by connecting unmatched power adapter to the machine, if the light for standby indication flashed, it shows that the output voltage from the power adaptor is too high and the adaptor needs to be changed. 8.Support power on boot and power on standby two modes.( Default is power on standby mode). 9.LED status indication, it can tell us the working state of the device very easily. 10.No loss of quality 11.Installs in minutes 12.Need DC5V/1A power supply