With this IR extender, you can operate up to 4 audiovisual devices inside a closed cabinet, using your own remote control. The Invisible Control Black 4 consists of an IR module including an IR Receiver and 4 IR emitter LEDs. You stick an emitter LED on each device you want to operate. This enables you to operate up to 4 devices inside a closed cabinet, using your own remote control. The IR module is a small box that you place in the line of sight.