These units (not just this brand) seem to be notoriously under-powered, particularly if there is any substantial structure (brick, stone, etc.) between the pushbutton and the chime unit. Try to locate the two pieces as close to each other as possible. If practical, mount the pushbutton unit on the door itself instead of the door frame (but only if the door is NOT made of metal.) *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid LandCamera "The problem can always be solved with the materials in the room." -My college Physics Lab Instructor