I'm in Ireland and looking at the complete PCI Max kit from PCS (transmitter, booster & PSU). However I'm not sure of the legalities of sending something like this through the post

I was wondering are there any issues I should know regarding shipping items like this to the EU, i.e. are there ever problems?
Is it possible to have them sent through ordinary mail or are they sent by courier?
If I ordered the PCI Max card on its own, could this be sent through ordinary mail?
Finally will the box have a big sticker on the outside saying "Transmitter"

desireradio