Wi-Fi signals

The problem with many IoT devices, though, is similar to with our other devices: what happens when the battery runs low? It's not easy to get a charger into our gut to repower smart pills, and for anyone worried about the ecological risks posed by computer or smartphone batteries, well, imagine tiny versions of those toxic batteries floating around in your body. We'll need sensors to track the damage done by our other sensors' dead batteries. Not with rectennas. Rectennas are powered by Wi-Fi signals, like the kind you use in your house or at Starbucks to get internet access. This is not a new concept, but what is new is that MIT researchers have been able to harvest enough power to make them useful, in a device only a few atoms thick.

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