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The electromagnetic spectrum is the range of all frecuencies of electromegnetic radiation

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Wi-Fi is a system for sending data over computer networks that uses radio waves.Wi-Fi routers receive the signal from the line provided by the telephone cornpany and distribute it to the Wi-Fi receiver devices within their reach.Wireless access points (WAP) act as remote transmitters: they are used in locations that the router's Wi-Fi signal cannot reach.

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computers (laptops and desktops)

mobile devices (smart phones and wearables)

and other equipment (printers and video cameras)

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Bluetooth relies on short-range radio frequency, and any device that incorporates the technology can communicate as long as it is within the required distance. This technology is normally used by personal computing devices, such as mobile phones and laptops.

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Infrared technology uses a transmission technique based on the light waves that move within the infrared spectrum. Maximum distance: one metre.