I bought this bell on the basis of good reviews and so far I am not disappointed! easy installation, appears to be of quality, melodies, volume control, and especially excellent reception (my portal is more than 100m from the house and no worries!) I still left outside, as a precaution, the former the protective cover to shelter some of the transmitter elements. so I am very happy, especially for the price, compared to the previous bought 4 times more expensive in a large teaches DIY ... and who passed away after 2 years ..! there just remains to be seen longevity of this one ...