Telekom warns of (its own) Wi-Fi router Speedport.

The integrated antennas of your Speedport send and receive radio signals for the provision of your WLAN (wireless network). Avoid setting up your Speedport in the immediate vicinity of sleeping, children’s rooms and lounges in order to keep the exposure to electromagnetic fields as low as possible.

Telekom Deutschland 9,2, 2017 kurzbedienungsanleitung-speedport-smart

Thanks to Professor Olle Johansson for pointing out these important  safety instructions.