Plug and Play System IR System Overview: An infrared (IR) extender system enables you to control your IR remote controlled A/V equipment from a remote location. This enables you to place your A/V components out of sight (behind cabinet doors, in the rear of a room, or in a different room) and still conveniently control your equipment. IR System Components: This infrared extender system includes the following items: IR Main System Unit: The IR Main System Unit provides a connection hub for one IR sensor (one included) or keypad and up to 4 IR flashers, and it is generally located near the A/V components. The Main System Unit, which is the "heart" of an IR extender system, has LED indicators to monitor the IR extender system. IR Sensors: IR Sensors, like the included surface mount model, are the "eyes" of the system, receiving IR commands from hand-held remote controls and relaying the commands to the Main System Unit via a CAT-5 or a 4-conductor shielded cable. Generally, sensors are placed so that you can easily and naturally point your remote control directly at them. Sensors are also available in wall-mount, ceiling-mount and tabletop models. IR Flashers: These IR MicroFlashers re-transmit the infrared signals from the IR Main System Unit to your A/V components. Flashers are the "voice" of an IR extender system that "speaks" to your components.A blue confirmation LED blinks when the Hidden IR Repeater system is receiving a remote control command, otherwise remaining unlit. For use in 220/240 volt countries, use a locally obtained 220/240 VAC to 12 volt DC, 100 mA adapter. The standard cable from the IR eye to the repeater box is 10' long If you need more cable length, add our Extension Cable Will work with cable boxes like the SA HDTV DVR's and DirectTV H21 which use a higher frequency. Dual Frequency IR Receiver comes with the original IR System.