Infrared is an electromagnetic wave having a wavelength between 750 nm and 1 mm. Its frequency is higher than that of microwave but lower than visible light, and it is a kind of light that human eyes cannot see. Due to the short wavelength of infrared light, the diffraction capability of obstacles is poor, so it is more suitable for applications where short-range wireless communication is required, and point-to-point linear data transmission is performed. The Infrared Data Association (IRDA) limits the wavelength of light waves used in infrared data communications to within 850 nm to 900 nm.
A mobile phone equipped with an infrared interface for wireless Internet access is very simple and does not require a connection cable and a PC CARD. You can connect to the Internet directly by setting up an infrared connection protocol.
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