Will the radiation generated by Amazfit GTR be harmful to user's body?

Amazfit GTR adopts low power-consuming Bluetooth chips, and the radiation level of the device is much lower than Bluetooth earphones, and it's less than one thousandth of the emission intensity of a mobile phone. The World Health Organization hasn't discovered any effects that Bluetooth signals bring to human body after over ten years of researches and investigations, so please rest assured to use it.