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Super-bright 5mm IR LED (25 pack) - 940nm
Infrared LEDs are used for remote controls (they're the little LED in the part you point at your TV) and 'night-vision' cameras, and these little blue guys are high powered ones!
If you want to make a sender/receiver pair, you'll want to get an IR remote receiver sensor as well. We have a tutorial that covers everything you'll need to know about IR remote control sensing as well as how to 'clone' a remote control