When I go into a shop and explain exactly what I want and am told by the operative that she doesn't know if they have a solution, then I begin to despair. I need a door bell (Americans call them Chimes) that is compatible with the home security device Ring,com. I can get a list of compatible devices from Ring.com's own web sites so I know what I'm looking for. To be told to make enquiries with any of the listed companies, because they don't stock any of the manufacturers on the list is really not acceptable because Maplin themselves sell the Ring.com product! Surely I just can not be the first person to have walked into Maplin with that request? Anyway, I then went to B & Q and bought the product - one of those listed - from the shelf. QED