Taihei Boeki Co.,Ltd. exhibited Wireless optical communication equipment LiFi at Wireless Japan 2021.
website：https://www.taiheiboeki.co.jp/product/optical-imaging/-lifi-purelifi-1.html
This is called LiFi.It is a wireless communication gear that doesn’t require a radio wave.
Right now, it is exchanging signals with the light that’s up here,
and you can wirelessly communicate using this device.The video on YouTube here is played with the light from the lantern.
You can utilize this in various places since it doesn’t use radio waves like WiFi.
It also has a high-security level, so it is safe to use at places with a lot of out-of-bound information like the hospital, military, factories, etc.
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