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

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

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The Wi-Fi have a wide range of signal but with the walls the signal could be interrupted.

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The devices that use Wi-Fi are the Wi-Fi routers and the wireless access points (WAP).

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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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The aproximately range of bluetooth is about 10 meters but with walls the signal may be weaker

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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.

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The range of the infrared technology is of 1 meter of distance.

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Some examples of devices that use infrared technology are remote controls, electric heaters and burglar alarm.