they are so easy to fit looks good nice and fresh simple plug in and fix bell to front door so easy great item love the different chime tone its so easy to fit even a child could do it . not that i am saying let a child fit it 52 different ring tones: they all sound real clear .The Waterproof Cordless Doorbell 4 levels of adjustable volume from 25db to 110db it real loud if you want it that way or low if you like The bell also has a volume control as it is quite loud and operates up to a distance of 200 ft.all you need in one simple and easy and complette setup I WOULD GET THIS SET UP