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This is a single IR emitter on a 4.9 ft cable with a 3.5 mm mono jack, made to plug into the IR OUT, IR TX or IR EMITTER port of an IR repeater or distribution box. The head has a +/-45 degree emission angle and is shielded against ambient light, so it fires a narrow beam at one device's IR receiver window. It suits people extending remote control to a set-top box, TV or AV component hidden in a cabinet. Compared with multi-emitter kits, it covers one device only and needs a powered repeater or hub behind it, but its long lead and small head make placement easy.
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This infrared emitter extension cable connects to an infrared forwarding device through a 3.5mm jack. It has a single black emitter head on a 1.5 meter (4.9 feet) cable. The emission angle is +/- 45°, and the emitter resists the effects of ambient light.
It uses a low current drive, so power consumption is low, and the launch distance is long. The head is small. It is used with infrared forwarding equipment, audio and video transmission equipment, IR remote wireless transceivers and centralized control equipment.
To set it up, plug it into the forwarding device's port, which is often labeled IR OUT, IR TX or IR EMITTER. Then stick the emitter head on the controlled device's panel, beside the infrared receiver tube. The receiver is usually behind a dark red translucent panel, and some devices mark it R, IR or INF. Shining a flashlight on the panel can help you spot the component inside a red box. Don't cover the receiver tube with the emitter head, or the device won't respond to the remote.