https://techcrunch.com/2019/01/14/wiliot-nabs-30m-from-amazon-avery-dennison-samsung-for-a-chip-that-runs-on-power-from-ambient-radio-frequencies/

As we continue the quest for better and more efficient sources of energy to link up our connected world, companies that are developing new power solutions are attracting attention.

Today, a startup called Wiliot, which makes semiconductors that harness ambient nanowatts of electromagnetic energy from cellular, WiFi and Bluetooth networks to work without batteries or other traditional wired power sources, announced that it has closed a $30 million round of funding.