it is true that I have another model uh chime, another brand, but it is revealing more problematic it did not last two years so disposable life, I hope with this bell, what better get a longer life. I recommend it, it will much better than my old 4 stars I attribute! simple, but lacks a sticker not you drill the support. But screw provides, it's a good point. I see the term with time I hope 5 years !!