See 802.11af, 802.11ah and Passive Wi-Fi.
"low-power Wi-Fi." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/low-power-wi-fi>.
low-power Wi-Fi. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/low-power-wi-fi
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