“REAC Embedded Power” is unique Roland technology that enables the transfer of not only the digital audio signal but also the power required by the connected device all via one CAT5e cable.The S-4000D Splitter and Power Distributor is equipped with 10 REAC ports including 8 ports of REAC Embedded Power. The S-4000D can automatically detect and distinguish a product not supporting REAC Embedded Power. In this case, power is not provided allowing the S-4000D to also function as a standard splitter when required.