Broan BK110NBWH Builder Chimes Kit with Pushbutton Nullify Imported Basic white textured cover for a design that blends with builder finishing techniques for Multi-Family dwellings For use with one or two entrances; two-note chime for front door, separate one-note tone for second door so no guest will be missed Order as standard pack of 24 to assist with your planning and still retain that economical edge Chime wires to a 16-volt transformer so you are assured of uninterrupted service and are never dependent upon batteries (transformer C905, included) Unlit rectangular shaped pushbutton with non-stick action included so you have one less thing to buy and the convenience of a complete Package