Future Interfaces Group at Carnegie Mellon University is exploring technology that could power your earbuds, or any other small gadget, by sucking electricity through your skin. They call it Power-over-Skin technology and work by transforming the human body into a power delivery medium, using RF signals to wirelessly transmit electricity across the skin. The system consists of a transmitter and a receiver.
The transmitter is a battery-powered unit that couples RF energy to the user’s skin. It could be integrated into existing items like a phone, smartwatch, or a power bank, which could be placed anywhere on the body. The receiver absorbs this RF energy, transforming it into usable power to operate a wearable gadget (like earbuds, rings, or any kind of low-power electronic device) which could be positioned elsewhere on the body.
More information:
https://www.fastcompany.com/91233975/carnegie-mellon-wearable-charging-using-body