I’ve bought some Christmas LED lights and the box says they are for indoor and outdoor use but that the “transformer is for indoor use only.”
I don’t know what a transformer is so I googled it and it seems to be the plug.
So I don’t understand? How can the lights be for outdoor use if you can only plug them in, inside? 
We have an outdoor plug socket attached to the house (for the lawnmower), does this mean they can’t be plugged into this?
Please help as I don’t understand 😅