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

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WIFI is a system for sending data over computer networks that uses radio waves.

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Its range usually reaches about 45 meters.

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Devices like wifi routers and wirelless access points work to interconnect wifi elements.

Devices like laptops and tablets have a built-in internal Wifi wireless card.

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Relies on short-range radio frequency and any device that incorporates the technology can communicate in the required distance.

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Its range is about 33 feet

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Its usually used by mobile phones and laptops

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Uses a transmission technique based on the light waves that move within the infrared spectrum

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It only reaches one meter maximum

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Devices like the TV control remote use infrared technology.