I have bought several of these over the years but only one has survived. But the one who survived is also a substitute for the deceased. They don't seem to have much longevity for more than a year or two. Went to another manufacturer (https://www.amazon.com/gp/product/B07CZ7KWP3/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&psc=1) Let's see how they are! But I cannot recommend Schumacher!