Calculator displays

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Possible Answers: LEDS.

Random information on the term “LEDS”:

Li-Fi, or light fidelity, refers to wireless communication systems using light from light-emitting diodes as a medium instead of traditional radio frequencies, as in technology using the trademark Wi-Fi. Li-Fi signals work by switching bulbs on and off incredibly quickly – too quickly to be noticed by the human eye. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be dimmed to the point that they were not visible to humans and yet still functional. Li-Fi is expected to be ten times cheaper than Wi-Fi.[145] Li-Fi has the advantage of being able to be used in electromagnetic sensitive areas such as in aircraft and nuclear power plants without causing interference. The light waves cannot penetrate walls which makes a much shorter range, though more secure from hacking, relative to Wi-Fi.[146][147] Direct line of sight isn’t necessary for Li-Fi to transmit signal. Light reflected off of the walls can carry 70 Mbps.[148] Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilises radio waves, Li-Fi uses visible light. While the US Federal Communications Commission has warned of a potential spectrum crisis because Wi-Fi is close to full capacity, Li-Fi has almost no limitations on capacity.[149] The visible light spectrum is 10,000 times larger than the entire radiofrequency spectrum.[150] Researchers have reached data rates of 10 Gbps, which is more than 250 times faster than superfast broadband.[151] The Li-Fi market is projected to be worth over $6 billion per year by 2018. Short range, low reliability and high installation costs are the potential drawbacks.[152]
Taken from Wikipedia