I had tried some cheaper alternatives previously, but I ended up with these and they're brilliant. Solved all the problems, very loud (but can be turned down if needed), modular (can add extra units or bell pushes etc), classy looking and no problems with range. I got rechargable batteries with a new charger and although a bit of an initial outlay am sure that I will have many years of service from them now. I thought I could take the one downstairs out into the garden if needed, but I positioned it close to the door and you can hear it from everywhere. It's also 100% reliable every time you push the button. Having missed someone at the door from the previous broken bell, which caused much inconvenience, I have great peace of mind that this will never happen again! Having one upstairs and one downstairs means that even with TV's/radio on etc bells can still be easily heard all round.