Set of Two 4-Ports gigabit ethernet igmp 4K 8K streaming multicast switch with single LC Connector fiber optic link ( one fiber ) to bridge full speed gigabit full-duplex ethernet over one single fiber single-mode (3Km) or multi-mode (500 meters).  Two power supplies included, can also operate connecting the power to a 5V USB source.  No Fiber Optic cables are included.