Horrible. I bought I think 10/12 strings of these to do all of outside trees for Christmas. 3 strings never came on at all —I’m getting replacements. The ones that have worked disappointedly barely stay on! I have had these out now for 6 days charging in the sun during the day. Each night that they have come on they haven’t lasted more than 2 hrs tops!! 
I will most likely try to return them all