Buying advice

I have been using the free avast for some time now and rarely have any problems, the virus count on my computers since switching to avast has massively dropped. This is why I want to upgrade to the full version, however I will soon be purchasing a laptop as well as having my desktop, I would like to have the full version of avast on both. So this is why I was wondering if any of the products are able to be used on 2 separate machines simultaneously (as in 2 licences or keys or whatever).

I’m sorry if this is the wrong place or if this question has been addressed previously.
Or for that matter if the answer was staring me in the face.

Thanks in advance to anyone with an answer and also sorry if I’m being dim xD

When you buy a lisense, you select how many device for how many years http://www.avast.com/en-eu/index

Thank-you very much