Researchers at the University of California, San Diego are developing a communication technology that uses the human body as a medium. According to them, this technology will eventually replace Bluetooth, which is less energy-intensive and safer for use in wearable devices. However, their research work is still in its early stages. Patrick Mercier, co-director of the University of California San Diego assistant and wearable sensor center, said that although Bluetooth is suitable for transmitting data over short distances, if there is someone in the middle of it, it will not perform as well. Because the human body can absorb the Bluetooth radio signal, the energy consumption of the Bluetooth device will increase. The magnetic field can easily pass through the body. Mesier and graduate student Jiwoong Park hope to develop a low-energy communication technology for wearable devices. They believe that by using magnetic signals that can pass through the human body, new technologies enable wearable devices to communicate more efficiently. Their experiments showed that electromagnetic waves can be transmitted from one side of the body to the other. Messier believes that this technology is more secure than Bluetooth because it uses the human body to transmit information instead of transmitting information over the air, increasing the difficulty of intercepting communication data between devices. He said that the magnetic field strength of this technology is "a few orders of magnitude lower" than doing a magnetic resonance imaging. This technology is still in the early prototype stage. Messier said that although they have developed some "preliminary" prototype systems, using the coils of the head to transmit brain activity data to the coils on the wrist and input them into a computer, the technology has not been integrated. Wear the device. He said that they will also conduct trials to transmit data from heart rate monitoring devices to smart watches. However, Messier suspects that this technology will not be applicable to devices that do not "surround" the human body, such as smart phones, because they cannot use the human body to transmit electromagnetic waves in the same way. Concerned about surprises
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The researchers found that when passing through the human body, the loss of electromagnetic waves is only one tenth of a million of the Bluetooth signal. This has led researchers to believe that this technology can be used to reduce the energy consumption of wearable devices when communicating. 
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Black technology: use the human body to transmit wireless signals or replace Bluetooth