We placed it on the door and the bell in the hallway, it has a distance of about 10 meters and walls. It works great and is powerful, it can be heard throughout the house (3 rooms). Melodies, volume withstands sun and rain, installation is easy, it has points for screws and adhesive. A battery that changes easily, overall it is very good! I recommend it...

Sometimes it works and sometimes it doesn't, without any factor changing. Result? It's like it doesn't exist. It's for throwing away, a waste of money.

The only negative thing is that I put it outside the garden gate and I needed another one for the front door of my house in a detached house!