I was not very sure of my purchase, but in fact this doorbell works perfectly. The transmitter is located behind a concrete column at a receiver located twenty meters inside just next to the door. But out of curiosity capita end of an alley, I tested from the street, about 70 meters, this time with a house in between and again no problem.The ringtones are varied and adjustable volume. Product supplied with an adapter to use two different types of batteries at the receiver, practice!
