@Apoalhasan 

Deco is simply another WiFi device and will have no difference from any other vendors mesh hardware.

If you have concerns over WiFi and human health you should do your own research and come to your own conclusions before making a purchasing decision.

@Philbert i read many articles about the danger of wireless devices signal , but need answer from tp-link company and confirm that.

@Apoalhasan 

I dont speak for TP Link, however its my opinion that it is unlikely any company would make such a statement; more so given that the majority of evidence does not indicate any effect on health from 2.4 or 5Ghz signals. 

This really should be your personal decision if you wish to use WiFi technology.

Hopefully someone from TP Link will be able to advise you on this and best of luck