Checkout coverage of our long range backscatter system on Economist.
https://www.economist.com/news/science-and-technology/21728866-long-range-frugal-new-chip-could-be-just-what-smart-city-needs-clever-way
Also check out other coverage:
https://spectrum.ieee.org/tech-talk/telecom/wireless/lowpower-sensors-use-backscatter-to-transmit-data-several-kilometers
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