I bought the first and it was faulty. I replaced it and the second stoped working after couple of weeks

It is very good and very easy to use.
I have placed the siren on the second floor and the bell is in a house on the ground floor, where a person in need has it. In all rooms of the house, when it is pressed, it can be heard perfectly on the second floor where the siren is. There is a connector that connects the two houses and the siren is next to the window where the connector is.

I used it in the country house which is 50 meters away from the estate's gate. The signal passed through a wall comfortably. Be careful not to place the transmitter behind or too close to iron. Its sound is very loud.

Quality for its price and excellent in its performance (distance of 20 meters with 3 intervening walls)

I have it on the 1st floor.
Excellent and the doorbell sticks perfectly with the double-sided tape it has on top.
No need for a drill.

Excellent product, quite powerful in sound. As for the range, I don't know because I have it at 10 meters and it works perfectly.