Infrared emitters are devices that emit infrared radiation, which has a wavelength longer than visible light. This type of radiation is invisible to the human eye, but it is used in a wide range of applications. Examples of common uses include remote controls for TVs, computers, home security systems, and other electronics, vehicle sensors that detect objects in the dark, surveillance cameras, and barcode readers. Often, infrared emitters are paired with infrared receivers to create a complete system, making it possible to transmit signals from one device to another.