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Wi-Fi is a system for sending data over computer networks that uses radio waves

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It has a big range, but the walls make the connection worse.

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Modern laptops and tablets usually have a built-in internal Wi-Fi wireless card. But certain desktop computers may require a Wi·Fi USB adapter or a Wi·Fi network card.

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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

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It has short range.

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This technology is normally used by personal computing devices, such as mobile phones and laptops and also by some headphones.

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Infrared technology uses a transmission technique based on the light waves that move within the infrared spectrum.

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The maximum range is one meter.

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This technology is used by TV's.

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The electromagnetic spectrum is the range of all frequencies of electromagnetic radiations, such as the ones mentions before.