Nokia is developing technology that could power cell phones by way of ambient radio waves. Electromagnetic radiation from WiFi transmitters, cell-phone antennas, and other similar devices could be converted into energy to power mobile devices wirelessly.
Prototypes currently can harvest 3 to 5 milliwatts of power, and Nokia's research team is working towards a prototype that can harvest 50 milliwatts. It works similarly to RFID chips that convert electromagnetic waves into an electrical signal
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