HDMI over Fiber 4-Port Receiver.
This HDMI over Fiber 4-Port Receiver works with the HDMI over Fiber 2-Port and 4-Port Transmitters.
The picture shows the 4-Port Receiver with the four fiber optic modules inserted. This model ships with only two fiber optic modules, the other two modules are optional.
This model is also known as "VG-RX4-MM HDMI - 4-Port Receiver."