Very mixed reviews for this ensemble of 2 chimes, a plug into a power outlet and a battery-operated, and a bell button on battery. Nothing to say for the doorbell button (too early to judge the strength of the battery) for either the plug-in chime perfectly fits the bill. For cons, the chime battery emits a ring tone that is heard as the room in which it is provided and there is no noise. On the other hand, obstacles are fatal to him; a tree, a wall or a window, 25 m and it is already limits ... I think he deserved to be equipped with a 9v battery Result, I miss visits ... It was not the intention!