The Infrared Emitter is an LED make from gallium arsenide ,with its color centered around 940nm. It's used to transmit infrared signals through an infrared LED, while there is an Infrared receiver to get the signals on the other side. We can not only use the emitter to transmit data or commands, but also to emulate remotes to control your home appliance using an Arduino. 

Speksit

• Connection Mode: D(digtal)
• Voltage:3.3-5V
• Distance:10m
• Dimensions(mm):20.0(L)x20.0(W)x11.0(H)

Osalista

• 1 X Crowtail- IR Emitter
• 1 X Crowtail 4 Pin Cable

Linkkivinkit

• IR Emitter Schematic
• IR Emitter Program
• Wiki link