I am not sure of the legal power output in Europe, but here is some info on 2.4ghz in the UK.


The frequency 2.4Ghz. It is one of the few frequencies available in the UK for use by citizens which does not require a license from the national regulatory authority. This arrangement is termed license exemption, and 2.4 Ghz is peculiar in that it is license exempt in many jurisdictions around the world. This exemption is the result of the status of 2.4 Ghz as part of a guard band around the frequencies used by microwave ovens, which was considered by regulators to be a trash band, unusable on noise grounds. It was therefore opened up for public use, though within strict power limits.


Regards

Jim