It's just what I needed for the home. Very easy to install: just set it next to the door button, and put the bells in 220v outlets, one downstairs, one upstairs, and that's it. You can adjust the volume from very low to very very strong, there are many choices of rings, but some are really ugly, I finally found. Fortunately, there is the classic option chime is heard even a little strong when we listen to music. It's just a shame that the button is not sealed, mount it away from rain. But other than that it's a good product, I recommend.