Muse has been tested and certified in accordance with Canadian, USA and European regulatory standards (FCC, UL, CE).
In order to make the device wireless, data is transmitted via Bluetooth, which is no different from other portable Bluetooth devices such as wireless headphones. Cell phones actually emit far greater electromagnetic radiation than Bluetooth.
The location of our Bluetooth antenna in Muse is on the outward facing side of the circuit board, so the signals are directed away from the user's head.
Muse 2016 uses Bluetooth 4 Low Energy (BTLE) and complies with all of the regulations for Bluetooth device sales. The output is far less than the emissions of a standard cell phone signal.
For more information check out the Muse's Technical Specifications: