IR, or infrared, communication is a common, inexpensive, and easy to use wireless communication technology. IR light is very similar to visible light, except that it has a slightlty longer wavelength. This means IR is undetectable to the human eye – perfect for wireless communication. Infrared Receiver Tube: Diameter : 5MM wavelength:940nm Forward Voltage: 1.2-1.3V Infrared Transmitting Tube: Size: 5mm Lens Color : Water Clear Forward Voltage (V) : 1.5~1.6 Forward Current (mA): 60mA Continuous, 120mA peak for 10% pulse width Wavelength (nm): 940 View Angle: 15-30 degree