I am using Deco E4R units around the house, but I would like to extend the network to an annex building we have that is about 25-30m from the house. 
running a cable will not be easy. 
Is their a deco unit that I can use to extend that distance? 
We have very slow internet, so we don't need a particularly fast connection. 
 

I would also like to extend the wifi into a very late garden,  and suggestions on the simplest way to do that?

thanks