Infrared LEDs are awesome. Along with an IR receiver they can be used for remote control and even basic remote data communication. The only problem is that your Arduino won't drive them to their full potential. The Max Power IR LED kit solves this problem by providing you with everything you need to drive a 950nm IR LED properly. Simply solder together this easy through-hole kit and you can switch the LED using a transistor. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10732 Datasheet: http://www.sparkfun.com/datasheets/Sensors/Infrared/YSL-R531FR1C-F1.pdf