Broan-NuTone Doorbell Kit, Plastic, White, 12V ac, 2 Lighted, Surface-Mount, 4.358 H x 6.733 W x 1.625 in. D

Smooth white cover with rounded corners for a fresh design that blends with builder finishing techniquesChime wires to a junction box transformer so you are assured of uninterrupted service and are never dependent upon batteries (transformer C915, included)Two lighted rectangular shaped pushbuttons with non-stick action included so you have one less thing to buy and the convenience of a complete packageJunction box transformer design makes for an easy and quick connection to low voltage wiring, insert into the single-gang junction box, and the transformer is safely concealed behind the wall