1.Three ways of optical fiber signals switch to one 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 40m. 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 8. LED status indication 9. No loss of quality 10. Installs in minutes 11.Need DC5V/500mA power supply