The transmission power of not even reach 10 meters. I had bought the gong for my garden. There, I can not hear the normal doorbell. 100 yd range are given. Unpacked The part and tried. Inside the home it works well. Loud and clearly audible. The bell is mounted by me at the doorstep. My wife expresses, in Garden can not hear anything (about 30m). On the terrace there is nothing to hear (ca.10m). In the apartment, (ca.5-6m) as it goes. But for that I need the ring part nich. So again electronic waste. Unfortunately, zero points.