It comes with a sticky back i believe... or that might be the smaller one and it comes with two screws?
Either way... dont touch it with a barge pole!! We had 100% return rate with these and we sold a lot, flipping fire hazard!! They are not even remotely safe near water!
Seriously... dont waste your money!
I think Arcadia do or about to do a small led moonlight strip? Maybe its just for reptiles... i didnt look into it... but anything made by Arcadia is guaranteed to be good