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The electromagnetic spectrum is the range of all frequencies of electromagnetic radiation

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Wi-Fi is a facility allowing computers, smartphones, or other devices to connect to the internet or communicate with one another wirelessly. In general, the average range of a hom Wi-Fi network can be between 30 and 90 meters.

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Bluetooth is a standard for the short-range wireless interconnection of mobile phones, computers, and other electronic devices.

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Infrared light, is a type of radiant energy that's invisible to human eyes but that we can feel as heat. As we know infrared (IR) devices are used in wireless personal area networks spanning coverage range of about 30 feet.