Wearable device transmits data 15 miles, 2,400 times distance of Wi-Fi, without significant network infrastructure.

https://news.arizona.edu/story/new-wearable-communication-system-offers-potential-reduce-digital-health-divide

"also enables wireless battery charging over 2 meters... uses LoRa, a patented type of LPWAN technology... circuitry and an antenna is large box seamlessly integrated into soft wearable custom 3D-printed to fit user... future: serve hundreds of square miles and hundreds of device users, using only a small number of connection points... monitor and transmit biological signals"