I had a pair. Worked fine for a season then wouldnt turn off. The build quality wasnt great. Replaced them with a Reubon Heaton 9000 which is different class in every way imaginable and well worth the extra cost.
I bought a set of these when they first came out, always worked ok, I do check them against my set of Avon’s occasionally,even dropped them in the pond once, took them apart sprayed with contact cleaner, as the on/off switch was sticking, and there still ok, do need a good battery in them, Duracell are good.