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

Wi-Fi signals will usually reach about 150 feet or over 45 meters for a 2.4Ghz frequency.

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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.

The range of the Bluetooth® connection is approximately 30 feet (10 meters).

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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.

Its frequency range is from 300 GHz to 400 THz.