Most AV components are controlled via an infrared (IR) remote control that requires a line of site to work between the remote control and the component(s). So components located behind closed doors can't be controlled unless the doors are open, which defeats the purpose. An IR repeater kit solves this problem. An IR repeater system is comprised of an IR receiver, Connecting Block and Emitters. The IR Receiver receives IR commands from your remote, passes it through to the connecting block and distributes the signals out through the IR emitters. This system allows you to keep a cable or satellite TV receiver, stereo receiver or amplifier, CD player, DVD player, Blu-ray player, or virtually any component controlled by an IR signal behind closed doors so you can use your remote control like normal.
Most IR system kits only come with one or two emitters, yet they usually support more. This emitter allows you to expand on one of the systems to control more AV components. By connecting directly to the AV devices you need to be controlled, this emitter (as part of a IR repeater system) provides "hardwired" IR control to your audio video gear.
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Dual IR Emitter is also available. A Dual IR Emitter features two IR flashers coming off of one cable (instead of a single flasher), so you can control more devices.