The communication between the Libre app and your sensor during activation uses short-range Near Field Communication (NFC), which makes it difficult to interfere with or intercept during transmission.
For ongoing glucose data, your sensor communicates via a standard Bluetooth Low Energy (BLE) connection operating at 2.402-2.480 GHz (GFSK; 4.6 dBm EIRP).
Bluetooth devices are extremely low powered, typically about 2.5 mW, which is less than a cordless phone and approximately 100 times less than the maximum power of a mobile phone.
The safety of radio waves has been extensively studied for more than 50 years. This large body of research has been reviewed by numerous independent expert panels, government agencies, and health authorities worldwide. All have reached the same general conclusion: there is no established evidence of adverse health effects from exposure to radio waves within the limits applied to wireless communications.
The World Health Organization (WHO) states: "Despite extensive research, to date there is no evidence to conclude that exposure to low level electromagnetic fields is harmful to human health."
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