I also got a few minutes with a headache I do not usually believe in headaches by "radiation", but this time it really occur with each use of the headset after about 2 - 3 minutes and usually resolve when the unit is turned off.
The customer service of the seller is not much help because it understands neither in German nor in English, which is the subject of the complaint.
In this respect, I would advise you to spend 10 euros more and to buy a better headset.